Side Gusset Bags.

Where the fold is. A stand-up pouch has its gusset at the bottom, which opens into a base and lets the bag stand on its own. A side gusset bag has folds down both sides and no bottom gusset at all.

The practical consequences: a side gusset holds more volume for a narrower shelf footprint and uses less film, so it is cheaper per unit of contents. But it does not stand reliably — it lies flat when empty and leans when part-filled.

Choose a side gusset when volume and cost matter more than shelf presence, which is why it dominates coffee and bulk dry goods. Choose a stand-up pouch when the bag has to present itself on a shelf.

Several reasons that all point the same way.

Volume. Coffee is sold in weights where volume per shelf inch matters, and the side folds hold a lot.

The valve. The flat front panel is the natural place to weld a one-way degassing valve, which fresh coffee needs.

The tin tie. The fold-and-clip closure the category is associated with sits naturally on this construction.

Vacuum packing. A foil side gusset with the air drawn out becomes a rigid brick — it stacks perfectly, ships densely, and visibly proves the pack has never been opened.

It is also simply the format the category has used for decades, and shoppers recognise it as what coffee looks like.

Not dependably, and this is worth being clear about before you order.

Empty, it lies flat. Part-filled, it leans. Completely full with settled contents it will usually stand, but it is not designed to and it will not hold that position as the product is used.

There are three normal ways brands handle this: merchandise the packs lying down, present them in a shelf tray or display outer, or vacuum-pack them so the bag becomes a rigid block. All three are common.

If the pack genuinely has to stand unaided from full to empty, the format is wrong — a stand-up pouch or a flat bottom pouch is what you want.