Construction
List shell fabric, lining material, insulation type and seam treatment separately. A wipe-clean lining is not proof that seams or the zipper retain liquid. Ask for the proposed construction rather than judging the material from a photograph.
Usable volume
Record capacity in L plus external and internal dimensions in in or cm. State the intended bottle, lunch container or ice-pack arrangement. Nominal volume may not describe the usable space around a curved zip opening.
Carry & closure
Specify handles, shoulder strap adjustment, pocket layout and zipper access. Define the intended loaded weight for a sample carry check. A stated rated load needs supporting exact-item test evidence and conditions.
Print & pack
Give artwork placement and dimensions, colors by quantity, individual packaging and carton pack ratio. Request carton dimensions and gross weight for the actual selected style; those figures affect the freight comparison.