Vacuum Sealer Bags: Rolls vs Pre-Cut Bags (and Which to Buy)
Quick answer: vacuum sealer rolls are cheaper per bag and let you cut any size, so they suit meat joints, fish and batch cooking. Pre-cut bags are faster and neater for regular portions. Whichever you choose, use embossed or textured bags made for vacuum sealers, between 70 and 100 microns thick, and leave 5cm to 8cm of space above the food for the seal.
The bags matter as much as the machine. The wrong bag will not hold a vacuum, and a bag that is too thin can be punctured by bones or frozen edges. This guide compares rolls and pre-cut bags, explains thickness and textured surfaces, and covers reusable alternatives. If you have not bought a machine yet, start with our vacuum sealer buying guide.
Why ordinary freezer bags do not work
Countertop vacuum sealers pull air out along small channels in the bag. Vacuum bags have one smooth side and one embossed or textured side to create those channels. A smooth freezer bag collapses onto itself, traps air and fails to seal. Handheld sealers are different: they use bags with a one-way valve on the front.
Rolls vs pre-cut bags
| Vacuum sealer rolls | Pre-cut bags | |
|---|---|---|
| Cost per bag | Lower, especially for small bags | Higher |
| Sizes | Any length you need | Fixed sizes |
| Speed | Need one extra seal to close the bottom | Ready to fill |
| Best for | Joints, whole fish, long items, batch cooking | Regular portions, quick jobs, sous vide |
| Waste | Very little, cut to length | Can be wasteful with odd sizes |
Bag thickness explained
Bag thickness is measured in microns or mil. Around 70 to 80 microns is fine for most foods. Choose 90 to 100 microns or more for bony meat, game and anything you will freeze for a long time. If a bag has punctured in the past, fold a piece of kitchen paper over sharp bones before sealing.
What size roll do I need?
- 20cm rolls: single portions, burgers, fish fillets, cheese.
- 28cm rolls: family portions, steaks laid side by side, joints. Most countertop machines have a 30cm seal bar, so 28cm is the largest roll they take.
A mixed pack such as the Bonsenkitchen 6 Pack Vacuum Sealer Rolls (3 x 20cm and 3 x 28cm rolls, £16.99) covers both.
Are vacuum sealer bags reusable?
Bags that held dry food, bread or vegetables can be washed, dried and resealed a few times, though each reseal makes the bag slightly shorter. Do not reuse bags that held raw meat, fish or eggs, as they are hard to clean safely. For everyday leftovers, reusable zip bags are a lower-waste option. See our reusable food bags, for example the Septeamay 12 Pack Silicone Freezer Bags (£7.99) or the IDEATECH Stand-Up Freezer Bags, 20 Pack (£18.99).
Are vacuum sealer bags safe in the microwave and for sous vide?
Most vacuum bags are made from food-safe polyethylene and nylon layers, made without BPA, and are safe for sous vide cooking up to around 100°C. Many are not designed for microwaving. Always check the packaging, and open the bag before reheating food in a microwave.
Tips for a perfect seal every time
- Keep the top 5cm of the bag clean and dry. Fold it back like a cuff while filling.
- Pre-freeze soups, sauces and juicy meat for an hour before sealing.
- Lay the bag flat and smooth out creases at the seal line.
- Double seal bags for long freezer storage.
- Label each bag with the contents and date using a permanent marker.
Freezing without a sealer? Our freezer bags range has heavy-duty zip and tie bags for everyday freezing.
Frequently asked questions
Can you use any bag with a vacuum sealer?
No. Countertop sealers need embossed or textured vacuum bags. Smooth freezer bags will not hold a vacuum.
Are vacuum sealer rolls cheaper than bags?
Yes, usually. Rolls cost less per bag and let you cut each bag to the exact length, so there is less waste.
Can vacuum sealer bags be reused?
Bags used for dry food, bread or vegetables can be washed and resealed a few times. Do not reuse bags that held raw meat, fish or eggs.
What thickness vacuum bag is best?
70 to 80 microns is fine for most foods. Use 90 to 100 microns or more for bony meat and long freezer storage.
Do all vacuum bags fit all machines?
Most embossed bags and rolls fit any countertop sealer if they are narrower than the seal bar, usually 30cm. Handheld sealers need their own valve bags.
