According to reviewers, the High Sierra Fat Boy is an excellent backpack for anyone over the age of 18 who needs to carry a lot of gear. It weighs just 2 pounds and earns praise in one professional test for superior… expanddurability, holding up to abrasion tests better than the competition. Users love the features on this 2,380-cubic-inch backpack, including built-in organizer pockets, a cell phone pouch, media pocket and key fob. Compression straps adjust the depth of the Fat Boy to accommodate varying amounts of gear, a feature that makes it more comfortable by eliminating sagging that experts say is bad for the back. Padded shoulder straps help distribute weight evenly. Some reviewers bemoan the lack of a water-bottle holder and a laptop sleeve, but most users are very pleased with this well-reviewed backpack, which comes with a lifetime warranty.