Lowepro Photo Trekker AW II Camera Backpack (Black) Photo Trekker AW II Capacity: Large 35mm or digital pro SLR;up to a 400mm f/2.8 flash and accessories or compact medium format system DayPack II is included, and can be attached to the Photo Trekker AW II for additional storage, or worn separately as a backpack. Fully customizable interior for any system. Lowepro's patented All Weather cover to protect bag and contents from extreme weather, sand, dirt, etc. SlipLock attachment slots allow you to attach additional Lowepro accessories and pouches to the Photo Trekker AW II.