Duffel Bag (Duffel Bag / Duffle Bags / Holdall)

You call it a “duffel bags” (or “duffle bags”)  in North America and a “holdall” in the UK or Australia. Craftspeople die‑cut the ends and bottoms from multiple fabric layers. They sandwich a plastic insert inside a double‑layer casing to create a flat, stable base. Zippers live in taped, heat‑sealed channels to block out moisture. Handles attach with box‑X stitch patterns so the bag can carry heavy loads. It also ranks as the most common custom bag.