Zpacks Arc Haul Ultra 50LZpacks Arc Haul Ultra 50l backpack is designed for long days on the trail, with ample space and durability for carrying essential gear. It is made from Ultra 100X material, known for being both ultralight and tough. The backpack features a roll top closure to keep water out, adjustable shoulder straps, and a customizable belt. Its side pockets are specifically designed to fit water bottles or soft bladders, with elastic tops for a snug fit.