What Size Grip Seal Bag Do I Need? A Sizing Guide for Small Parts, Jewellery and Samples

Grip seal bags come in a wider range of small sizes than most people expect, and picking the wrong one is an easy mistake to make when you're ordering in bulk for the first time. Too small and the item won't fit or the seal strains to close. Too large and you're using more bag than you need, which adds up in cost and looks untidy if presentation matters for what you're packaging.

This guide covers how grip seal bag sizing works, what each common size is actually used for, and how to choose the right one for jewellery, small parts, samples and general organisation.

How grip seal bag sizes are measured

Grip seal bags are sized by their internal dimensions, given as width by height, usually in millimetres or inches depending on the supplier. This is the actual usable space inside the bag, not including the grip seal strip itself at the top. When comparing sizes across different ranges, always check whether the measurement given is for the bag including the seal or excluding it, as this can vary slightly between suppliers and cause confusion if you're trying to match a size to a specific item.

Mr Bags' grip seal range runs from small sizes around 30x30mm and 2x2 inches up to 100x150mm, covering everything from tiny components through to small retail items.

What size grip seal bag for jewellery?

Jewellery is one of the most common uses for grip seal bags, and the right size depends on the type of piece.

For earrings, a small bag around 30x30mm to 40x40mm is usually enough, giving just enough room for a paired set without excess empty space. For rings, a similar small size works well, particularly if you're including a small card or backing to keep the ring from moving inside the bag. For necklaces and bracelets, sizing depends on the chain length, but 45x50mm to 50x50mm tends to give enough room for a folded or coiled chain without the bag being noticeably larger than the contents.

If you're packaging multiple pieces together as a set, sizing up to the next bracket gives enough room to keep everything contained without overstuffing the bag, which can put unnecessary strain on the seal.

What size grip seal bag for small parts and components?

For hardware, screws, small electronic components, craft supplies and similar items, the right size depends entirely on what you're storing, but a few general patterns hold up well in practice.

Very small components, individual screws, beads, or tiny craft items, fit well in the smallest available sizes, around 30x30mm. For slightly larger parts, such as small brackets, multi-piece hardware sets, or grouped craft supplies, sizing up to 40x40mm or 45x50mm gives more working room without the bag becoming impractically large for storage in a parts bin or drawer.

If you're using grip seal bags for warehouse or fulfilment organisation, where bags are likely to be labelled and stored in bins or on shelves, it's worth standardising on one or two sizes across your most common item types rather than having a different size for every product. This makes storage, picking and reordering considerably simpler.

What size grip seal bag for samples?

Sample packaging, whether for cosmetics, food samples, fabric swatches or promotional items, tends to need slightly more room than jewellery or small hardware, simply because samples are often a small quantity of product rather than a single solid item. The 45x50mm to 100x150mm range covers most sample use cases, with the larger end of that range suited to fabric swatches, multiple small items bundled together, or anything with a bit of bulk to it.

For samples that need to remain dry, dust-free or otherwise protected, the grip seal closure itself does most of the work regardless of size, so the sizing decision here is mostly about fit and presentation rather than protection.

A quick size reference guide

These are starting points rather than fixed rules. The best way to confirm a size is right is to measure the item or items you're packaging, including a small margin for ease of access and to avoid straining the seal when closing.

What if your item doesn't fit any of the standard sizes?

For items that fall between standard sizes, it's generally better to size up rather than down. A grip seal bag that's slightly larger than strictly necessary still functions perfectly well and is easier to open, close and label than one that's a tight squeeze. The exception is if you're using the bag size as a visual cue for stock identification or sorting, in which case consistency across similar items matters more than getting each individual size perfectly matched.

Clear, coloured or printed: does size choice change by type?

No. Clear, coloured and printed grip seal bags are available across the same size range, so the sizing guidance above applies regardless of which type you choose. The decision between clear, coloured and printed is about visibility, sorting and presentation rather than fit. Clear bags give full visibility of contents, which suits retail display and quick identification. Coloured bags are useful for colour-coding different SKUs, product lines or order types. Printed bags add a branded or decorative finish, often used for gifting, party favours or retail packaging where presentation matters as much as containment.

Buying the right quantity alongside the right size

Once you've settled on the size or sizes you need, buying in bulk brings the cost per bag down considerably, which matters if you're using grip seal bags as a regular part of your packaging or fulfilment process rather than an occasional need. Standard pack sizes of 100 or 500 are common, and for businesses with consistent repeat use, ordering in the larger pack size is almost always the more cost-effective choice over time.

You can browse the full range, including clear, coloured and printed options across all available sizes, on our grip seal bags page. If you're not sure which size suits what you're packaging, get in touch and we can help you work it out before you commit to a bulk order.