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Gusset
Also known as: pouch gusset, side gusset, bottom gusset, bellows fold, expandable fold
A gusset is an inward fold added to the side or base of a pouch that opens out when filled to add volume.
A gusset is an inward fold built into the side or base of a flexible pouch. When the pouch is filled, the fold opens out and adds volume, turning a flat film into a three-dimensional pack.
Types
- Side gussets run along both sides, giving a near-rectangular cross-section; they are used in side-gusseted bags, quad-seal and flat-bottom pouches.
- Bottom gusset is a W-shaped fold in the base that opens into a standing footprint, the defining feature of a doypack; see bottom gusset.
- Top gussets exist but are rarer.
What gussets do
They increase capacity for a given front size, help the pack stand, provide extra print panels for ingredients, barcodes and instructions, and still let empty pouches ship flat.
Specifying gussets
Pouch sizes are usually written as width × height × gusset. Always confirm whether the gusset figure means the full opened depth or one side, as conventions vary; see pouch dimensions. Keep text away from fold lines, and choose film thickness and seal strength to suit deeper gussets and heavier fills.
Frequently asked
What is a gusset on a pouch?
It is a fold in the side or bottom of the pouch that expands when filled, increasing capacity and in some formats letting the pack stand.
How are gusset dimensions written?
Usually as width × height × gusset. Check with your supplier whether the gusset figure refers to the total opened depth.
Related terms
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