Each tier of crafting makes a higher quality bag (10 slots, 12 slots, 15 slots, etc).8 slot bags can be made by crafters (tailor, leatherworker, armorsmith) with 20 tier 1 materials (jute scrap, rawhide scraps, copper ore).
4 slot bags can be purchased from vendors for 32 copper.Crafting Material / Cooking Material / Mini-Pet Storage… You can have 250 of each crafting item stored.Here are some things I’ve found out about GW 2 to help me plan my storage space. The main problem is that I love to craft and quest and always have a ton of those items on hand. I always run out of inventory space in any MMO I play. Guild Wars 2 Inventory Space Management Guide by Jerich