Hyperlite Mountain Gear Porter 4400 (70L) in size L. I used it for a week-long long trail in the US and about twice for overnight stays in snowy mountains in Japan. The bottom shows noticeable discoloration from train and plane travel, as well as use on long trails, but there are no tears whatsoever. It functions perfectly and can still be used for a long time. As a side note, a BEAR VAULT bear canister BV500 fits snugly inside horizontally. It comes with a separately sold Porter-specific pocket. Material: DCF Size: 50-100 L