Vacuum Seal Weed Bags.

Almost always because the bag is smooth and your machine is a suction sealer. It is the single most common problem with vacuum bags, and it is a specification issue rather than a fault.

A household or countertop suction sealer pulls air out through the open end of the bag. If the film is smooth, the two walls press flat against each other as soon as the pump starts and seal off the air path. The machine draws for a second, achieves nothing, and stops.

Embossed channel film has a textured inner surface that keeps micro-channels open along the length of the bag, so air can keep travelling to the pump until the pack is drawn down.

A chamber sealer works differently — it evacuates the whole chamber, so pressure is equal inside and outside the bag and smooth film is fine.

Tell us which machine you use and we will specify the right film.

They contain it well, provided the barrier is real and the seals are sound.

Two things do the work. First, removing the air removes most of the volatile compounds that would otherwise be pushed out when the bag is squeezed. Second — and more importantly — the film has to be a genuine multi-layer barrier structure. Foil is the most effective.

What does not work is a thick single-layer plastic bag. Odour molecules pass through cheap film regardless of how good the seals are, and thickness alone does not fix it. If a supplier is selling "smell proof" on gauge rather than structure, that is the wrong bag.

Seal integrity matters as much as material. A perfect barrier film with a contaminated seal leaks, so keep product out of the seal area when filling.

It compresses it, and whether that matters depends on what you are selling.

Vacuum removes the air from between and within the buds, so the flower physically compacts. Trichomes can be damaged where buds press against each other under pressure, and the structure of the bud flattens. For premium flower sold on appearance, that is a real cost and most producers avoid full vacuum for that reason.

For bulk storage, transport and processing material it is much less of a concern, and the benefits — oxygen removal, volume reduction, odour control — clearly outweigh it.

If you want the oxygen protection without the compression, the alternative is a foil barrier bag with a nitrogen flush or an oxygen absorber rather than a drawn vacuum. Tell us the product and we will point you to the right one.