Quad Seal Bags.

Both give you straight sides and multiple print panels, and they are easy to confuse.

A quad seal has a vertical seal at each of its four corners. Those seals stiffen the edges and hold the sides flat. The base is formed by the side gussets meeting at the bottom.

A flat bottom pouch has a genuine rectangular base panel — an actual fifth panel of film — which makes it squarer still and gives it a printable base.

In practice: the flat bottom is squarer, blocks flush on shelf, and gives you five print panels. The quad seal gives you four, is structurally stronger under dense loads, and costs less. For heavy product, quad seal. For maximum shelf presence, flat bottom.

We build them from around 500 g up to 25 kg, and the construction is chosen by weight and density together rather than weight alone.

Up to about 2 kg, standard gauge film is fine. From 2–10 kg we specify a heavier laminate, because dense contents abrade the inner layer and load the base seal every time the bag is handled. Above 5 kg a reinforced die-cut handle stops customers carrying the pack by a corner until it tears.

Beyond 15 kg we usually move to a woven laminate, where tear strength matters more than print finish.

Density matters as much as weight — 5 kg of rice is a much smaller, denser, harder-working bag than 5 kg of pet treats.

Because pet food is dense, oily, sold in large formats, and bought off a shelf where it has to look considered.

Density — kibble settles and pushes outward. A stand-up pouch bulges into a sack shape; the quad seal's corner seals hold the sides flat.

Oil — pet food's fats reward a real barrier structure, often foil, which keeps every serving tasting freshly packed.

Size — these are 2–15 kg packs. At that weight the bag is a carrying device, so a reinforced handle is standard.

Shelf — four real print panels let brands put feeding guides and ingredient detail on the sides while keeping the front clean.