Stanley Adventure Canister Set, Stainless Steel 18/8 Stainless Steel won't rust. Naturally BPA-free Leak proof, fully packable. Won't leak or let water in while in coolers One-piece nesting set (3 bodies + 3 lids) saves space when packing or storing Raised lid edges make stacking and carrying multiple containers easy Durable lids and bodies are dishwasher safe