I would start from folded product dimensions rather than copying a generic supplier catalog.
A useful size program might include:
- small for T-shirts, tanks, and accessories;
- medium for sweaters and midweight apparel;
- large for jackets, hoodies, and bulky garments.
But the final dimensions should account for:
- folding standard;
- garment thickness;
- closure area;
- air removal;
- barcode placement;
- carton dimensions;
- packing speed;
- return use.
Oversized bags waste material and shipping volume. Undersized bags create tension at the closure and make packing slower.
A short warehouse trial with actual garments is more useful than choosing dimensions from a spreadsheet alone.