Sealing & resealing bags

Buy from an extensive range of sealable and resealable bags, including grip seal bags, zip seal bags and self-seal bags.

Sealing and resealing bags are...

• Reusable polythene bags that can be opened and closed
• Designed for multiple use - open and close as many time as you like!
• Bags that can be sealed by a variety of means, including self-seal bags

Self-seal bags are...

• Manufactured with an integral sealing strip, located along the bag opening, to allow for easy opening and closure
• Also known as minigrip bags, mini-grip bags, gripper bags, grippa bags and resealable bags
• Ideal for securing bag contents and avoiding leakage or contamination
• Available in a variety styles to suit a range of uses, from storage bags to carrier bags
• Available in clear polythene with or without labels - to make a note of bag contents and help retrieval
• Available in variety of coloured opaque polythene - e.g. red, green, blue or black - to help with item storage and colour-coded retrieval
• Also available in more specialist polythene, from heavy duty grip seal bags to anti-static grip seal bags
• Sometimes referred to as zip seal bags. However…

Zip seal bags are…

• Manufactured with a metal zip fastener or zip seal, making them…
• A more premium bag than a grip seal bag
• Used for storing important documents, such as art portfolios or school project work
• Ideal for use as a wallet for conference delegates or for exhibition attendees
• Also known as zip bags, ziplite bags or zipper bags

Sealable, resealable and self-sealable - there's more than one way to seal a bag

Sealable bags

Any plastic bag that can be sealed shut can be described as a sealable bag.

The sealing process can be carried out by any means, including a bag tie or clip (e.g. a sandwich bag with a twist tie), an adhesive strip, either external (e.g. sealing any bag with cellotape) or internal (e.g. as with a mailing bag), an internal self-seal strip (e.g. as with a minigrip bag) or by heat sealing with an external sealer (e.g. as with vacuum bags).

So any plastic bag that is designed with a seal can be called a sealable bag. However, not all sealable bags can be called resealable bags.

Resealable bags

Only bags where the seal can be reused can be classified as resealable bags. Some bags, such as mailing bags, feature a single-use seal that can't be reused without tearing open the bag itself and thus rendering it useless. Mailing bags are a very convenient way of sending post - thanks to their integral adhesive seal - but, because their seal is strong enough to keep the mail contents secude until the bag is cut or ripped open by the recipient, then a mailing bag is not a resealable bag, although it is a sealable bag.

Self-seal bags

Not every sealable bag be called a self-seal bag. This monicker is reserved only for bags that can be sealed closed without using any external sealing accessory - including adhesive tape, clips or bag ties - and without the use of a heat sealer to melt the polythene and seal the bag.

The most popular types of resealable bags are grip seal bags. These bags, which are sometimes known as mini-grip bags, gripper bags or grippa bags, feature an integral seal that runs along the top of the bag.

The seal contains a male (single) and female (double) ridge of plastic on opposite sides of the bag opening. When the seal is squeezed gently between thumb and forefinger, the male ridge fits snuggly into the female ridges to close the bag. This seal protects the contents of the bag from moisture, dirt and other external contaminants.

It can be used over and over again, which means the grip seal bag is a sealable bag, a self-seal bag and a resealable bag.

This handy bag is available in a huge range of sizes, made from clear, coloured or black polythene, with or without labels to make handy notes on the bag and with specialist options including antistatic bags - to keep electrical components safe - and specimen bags with accompanying record cards - perfect for hospitals, doctors' surgeries and police stations.

Methods of sealing plastic bags

The most common ways of sealing a polythene bag are by:

Sealing the bag with ties or clips. Fasten any bag shut with a plastic clip or twist shut with a tie. A popular method of sealing food bags for domestic use (e.g. clip a packet of frozen peas shut before placing in freezer, twist a sandwich bag closed for a packed lunch etc.)

Sealing the bag with a built-in adhesive flap. Some bags such as mailing bags are manufactured with a flap opening, where the flap contains a built-in adhesive strip attached along its length. Simply remove the cover from the adhesive and press the flap down to seal.

Sealing the bag with a built-in grip or zip seal. A range of bags are available with an integral strip that seals shut either by squeezing the seal together (grip seal) or pulling closed (zip seal). Very handy for regular use as they can be used over and over, these bags also provide great protection from moisture, dirt etc.

Sealing the bag with a heat sealer. If you really want to seal your bag shut tight this is the method for you. A heat sealer will bond two pieces of plastic when placed together in the sealer and the sealer is closed shut. A one-time seal, this method of sealing bags is popular for vacuum packing food.

Where to buy sealing and resealing bags

Resealable bag manufacturers and suppliers include:

Ziplock Bags
The home of ziplock bags online, this website features everything you need on ziplock, zipper, ziplite, grip seal and all self-seal bags. With a huge range of products at great prices and free delivery within the UK, this is the number one ziplock website out there.
www.ziplockbags.co.uk

Self Seal Bags
Specialists in self-seal bags, this website stocks a huge range of resealable bags from grip seal to mini grip and ziplock to ziplite. Packed with loads of useful information to help you choose the right bag for you, with free delivery to UK addresses.
www.self-seal-bags.co.uk

Plastic Self Seal Bags
Discount Self Seal Bags is the place to go to get resealable plastic bags at discount prices. Also features loads of useful information on self-seal bags, including a handy buying guide to make sure you pick the right sort of resealable bag for you.
www.discountselfsealbags.co.uk

Minigrip Bags
A website loaded with information on minigrip bags - aka grippa bags - and all types of self-sealing bags, with list of the best places to buy them online. Features a useful guide to anti-static self-seal bags, what they are used for and how they work.
www.minigrip-bags.co.uk

Zip Seal Bags
Zip Seal Bags contains loads of great information on zip seal bags and other types of self-seal polythene bags and eco-friendly alternatives. It also features a handy list of online zip seal bag retailers.
www.zipsealbags.co.uk

Antistatic Bags
Antistatic bags is the number one website dedicated to antistatic bags. Containing a wealth of information on antistatic packaging and how it works, along with details of where to buy it at the best possible prices.
www.antistatic-bags.co.uk

Resealable Bags
Resealable-Bags is a division of Polybags Ltd, the UK's number one polythene manufacturer, that specialises in resealable bags. Offering an unrivalled range of resealable bags and other polythene packaging at the best prices online.
www.resealable-bags.co.uk

Research & Resources

For plenty more information on sealing and resealing bags, including the manufacturing process, types of self-seal bags available and their many uses, please visit:

PlasticBags.uk.com: Browse through a huge range of self seal bags websites or, if you are a manufacturer, list your products for free on this online directory specialising in self seal bags and other plastic packaging.

PackagingKnowledge: The UK packaging industry's number one website contains huge amounts of information and in-depth articles on self seal bags.

Goldstork: This free online directory features specially selected information and hand-picked features on a range of self seal bags and resealable bags.

What is static electricity?

Every object in the world - ourselves included - is made of atoms, which are in turn made of protons, neutrons and electrons. While neutrons have no charge, protons are positively charged and electrons are negatively charged.

In normal circumstances, the number of protons and electrons in an atom balance each other out, meaning that atoms have no charge. However, when two items rub together or separate, the electrons contained within these items can move from atom to atom or even from item to item, thus giving the atoms a positive or negative charge.

If the items involved in this situation are made from a material that does not conduct electricity - an insulator - then this charge can not move. The result is static electricity.

How do antistatic self-seal bags work?

If any static electricity comes into contact with an antistatic self-seal bag, rather than pass through the bag and risk damaging the electrical components inside the bag, the electricity passes around the bag and dissipates before it can make contact with the components, thus removing the possibility of damage.

Interesting information about sealing & resealing bags

For operatours decanting bulk kilo sacks of complimentary-flowing granulate into smaller issue quantities, gripper bags solve a very normal nevertheless stubborn handling problem: they enable pre-pack without introducing unnecessary complexity at the select-face. In practice, that means a line can smash down simmering granular stock from bulk format into 400 reclosable units, then grasp them in tidy secondary bagging or cartonised consignments with far better pallet stability than open-mouthed alternatives. The detail that tends to matter on the warehouse floor is film behaviour rather than headline gauge alone polythene suppliers with consistent melt-flow and decent seal integrity resists split corners below repetitive handling, while the closure lip requirements enough stiffness to open cleanly yet still close positively when fines migrate towards the mouth. There is also a logistical earn that rarely appears in list of products copy: pre-packing improves volumetric efficiency in despatch, reduces tare weight against rigid tubs, and curbs stock loss from repeated exposure to ambient moisture or dust ingress. If the specification remains mono-material polythene suppliers, recyclability is at least more straightforward than with laminated formats; that matters where waste streams are audited properly and packaging energy is amortised across multiple handling cycles rather than treated as a disposable afterthought.

Grippa bags sit in a rather practical corner of the packaging trade: a light-gauge polythene suppliers format with an integrated rib-and-groove closure that enables repeated opening without inviting the sealing variability associated with loose secondary bagging. Their value on the warehouse floor is less about novelty than control. When small parts, fixings, samples or kit components need to be marshalled at select-face level, the closure profile reduces handling time, limits spillage amid tote movement and maintains pallet presentation without the tare weight penalty of rigid alternatives. Much depends, nevertheless, on film specification rather than the mere presence of a zip strip; high-density and low-density blends alter stiffness, puncture behaviour and clarity, while micron-specific gauging determines whether the bag will tolerate sharp-edged contents or simply split at the side weld below compression. In applications where dust ingress, light moisture exposure or stock segregation are the proper irritants, that packaging supplierble mouth does the quiet work of preserving order. There is also a circular-economy calculation behind the format when it is sensibly specified as a mono-material polythene suppliers building: recyclability remains more straightforward, transport volumetric efficiency tends to be favourable, and the amortised energy tied up in repeated reuse is appreciably below with heavier packs brought in merely to achieve the same degree of containment.

Minigrip bags are often treated as a humble stores item, yet the press-to-close profile is a tidy part of polymer engineering: two extruded ribs must meet with enough interference to give tactile closure, nevertheless not so much that operatours lose time at the select-face or distort the mouth of the bag amid repeat access. The better grades rely on melt-flow consistency and micron-specific gauging, because a few microns either method can alter seal feel, puncture resistance and the method the bag presents in secondary bagging or kitting cells. In a warehouse context the value is rarely in the bag alone; it sits in reduced tare weight, improved count accuracy, cleaner segregation of small components and better volumetric efficiency inside totes, cartons and returnable transit packaging. Static can still be a nuisance with light-gauge polythene suppliers, particularly around fine parts, labels and dusty stock, so anti-static formulations or controlled surface resistivity become above a specification footnote. The circular economy argument is similarly practical rather than decorative: mono-material polythene suppliers buildings simplify recycling routes, while downgauging reduces polymer use only if the closure geometry, side-weld integrity and pallet stability of the packed consignment remain intact. That is where the industrial reality liesnot in the novelty of packaging supplierbility, nevertheless in the balance between polymer behaviour, handling cadence and waste avoidance across thousands of small, repetitive movements.

Mini Grip Bags

Mini grip bags sit in an awkward nevertheless commercially useful corner of the packaging floor: also small to behave like normal-purpose polythene suppliers sacks, yet relied upon where component control, visual identification and clean secondary bagging have to happen at pace. In practice, their value lies less in the closure itself than in the engineering tolerances around it film gauge has to be tight enough to resist split propagation at the lip, while the press-seal profile must retain melt-flow consistency across production runs or select-face efficiency suffers almost immediately through partial closures and mispicks. The better formats tend to be mono-material polythene suppliers, which simplifies mail-use recovery compared with mixed laminates, and the low tare weight assists volumetric efficiency when consignments are built for dense, small-count stock like fixings, seals or electrical sundries. Anti-static grades are often specified where fines, lightweight parts or sensitive assemblies are involved; without that control, surface resistivity becomes a warehouse nuisance rather than an academic metric, drawing dust into the bag mouth and slowing manual packing. What sees, from the list of products hierarchy, like a simple display-line item is in reality a packaging format governed by quite fussy trade-offs between clarity, seal repeatability, pallet stability in outer cartons and the broader pressure to retain material streams straightforward enough for viable circular handling.

Hot promotions in antistatic packaging supplierble bags on aliexpress:

Antistatic packaging supplierble bags occupy an awkward nevertheless indispensable corner of packaging engineering: outwardly simple, yet specified against failure modes that only become visible once product beginnings sticking, arcing or drifting out of rely on the bench. The contrast between a merely cost-effective bag and a properly engineered one lies less in appearance than in film behavioursurface resistivity held within a controlled band, consistent gauge across the web, and a polythene suppliers structure that closes repeatedly without zipper fatigue or edge split amid secondary bagging. On the warehouse floor, those details translate directly into select-face efficiency and consignment reliability; a bag that seals cleanly, carries a low tare weight and maintains pallet stability without excessive carton occupy improves volumetric efficiency in a method flimsy stock seldom does. There is also the circular economy question, which is normally ducked in low-stop trade copy: antistatic performance often relies on additive chemistry, and that can complicate downstream recovery unless the format is designed as a mono-material stream with predictable melt-flow consistency. Serious buyers tend to read past claims of ESD safe and see instead for repeatable material data, closure durability and the extent to which the bag mitigates handling losses while remaining viable within increasingly tighter recyclability and feedstock-sustainability requirements.

packaging manufacturers launch heavy duty grip seal bags

Their recent launch of heavy duty grip seal bags means Kite now supply one of the biggest, price competitive spectrums on the market.

Antistatic Bags

Open and zip top Antistatic Bags. 5 layer building. Made in United Kingdom. 

Specimen bags in a surgical setting are deceptively simple articles, yet their specification tends to expose the gap between list of products buying and theatre-floor reality: a pouch that is also small encourages double-handling and secondary bagging, while excess gauge adds needless tare weight across high-volume clinical stock. The better spectrums are normally built around micron-specific gauging and controlled seal geometry, with low-density or high-density polythene suppliers selected according to puncture risk, clarity requirements and the need for proper closure below gloved handling. Surface behaviour matters as well; a bag that clings through static or presents poorly at the select-face slows the chain from theatre to pathology, particularly where wet specimens, request forms and absorbent media must remain segregated without compromising traceability. Size breadth so has a practical purpose beyond mere selection: small formats keep safe volumetric efficiency in bins and trolleys, larger gusseted variants accommodate strange tissue loads without stressing the weld, and consistent melt-flow amid manufacture gives the seal a repeatable failure margin rather than a hopeful one. Where procurement teams are pressing for lower waste, mono-material buildings assist downstream recyclability of uncontaminated surplus and reduce unnecessary laminate complexity, although clinical pollution will frequently dictate the last disposal route; the sensible engineering trade-off is a bag robust enough to mitigate leakage and misidentification, nevertheless not so above-specified that amortised energy, storage cube and ward-level replenishment all suffer.

Slider grip bags sit in that awkward nevertheless heavily used corner of polythene suppliers packaging where the closure is expected to behave like a small mechanical component rather than a mere seam: the track must tolerate repeated opening, the slider must dash without snagging on gauge tolerance, and the film itself has to grasp a clean profile after filling, handling and secondary bagging. In practice, this pushes the manufacturer towards tight micron-specific gauging and disciplined melt-flow consistency, particularly where low-density or high-density polymer blends are tuned for clarity, puncture resistance or stiffness at the mouth. On the warehouse floor the attraction is not aesthetic; a reclosable pack improves select-face efficiency, reduces part loss in mixed consignments and retains small components, documents or hygiene-sensitive stock from migrating through cartons amid transit. The closure also affects logistics in less visible methods: a fat slider can compromise volumetric efficiency if above-specified, while a below-gauged film may deform below compression and disturb pallet stability once enclosed. For longer runs, tailored print and size control tend to be as much about stock discipline as presentation, allowing operatours to rationalise SKUs and reduce the drift into ad hoc above-bagging. The circular economy argument is more nuanced than the normal leaflet language recommends; mono-material polythene suppliers formats are easier to recover than laminated structures, nevertheless the added slider, pigment load and any label stock have to be considered against amortised energy, pollution risk and the proper probability of mail-use segregation. Done properly, slider grip bags are not simply shopping pouches with a moving tabthey are a small exercise in closure engineering, film chemistry and distribution pragmatism.

Where Can I Buy Kikkerland Mason Jar Zipper Bags?

Zipper bags occupy a rather more technical corner of the packaging aisle than their domestic silhouette recommends; the better examples rely on controlled-gauge polythene suppliers film, consistent melt-flow behaviour and a closure profile that can tolerate repeated flexing without whitening, splitting or losing bite below light compression. In distribution terms, the attraction is not merely reusability nevertheless volumetric discipline: a flat, low-tare format reduces null space against rigid containers, improves select-face efficiency and retains mixed small-parts consignments legible without resorting to secondary bagging. Surface stop also matters. Too much slip and stacked stock migrates on the pallet; also small and the operatour fights the bag at the bench, particularly with gloved handling. Where transparent film is used, optical clarity has to be balanced against puncture resistance, as aggressive downgauging can leave high-density polymer chains insufficiently supported at the seal shoulders. The circular-economy argument is similarly practical rather than sentimental: mono-material zipper bags, specified with sensible wall thickness and clean colour selections, are easier to recover into lower-grade feedstock, while heavy-duty closures amortise the embodied energy above multiple handling cycles rather than a single transit event.