Nobody will buy this heavy-duty rucksack as their first backpack. You buy it after you've tried a handful of other options that sacrifice style, function, or durability, and now you want something that doesn't sacrifice. Something that will last. The Mountainback five-pocket waxed-canvas backpack was built to be the most durable backpack on the market, and it's definitely the toughest one we've ever seen. Twenty-four-ounce waxed canvas from Scotland makes up the bulk of this bag, repelling water and taking the brunt of the wear. Any leather pieces are old bull leather, thick and hard enough to last forever but gaining flexibility over time and use. A special polyester thread used in ship sails sews the whole thing together. In all stress points are top-quality marine stainless steel hardware and brass rivets that have been "hand hammered by a thick-wristed man." The leather strap closure system on the pockets is something I am very surprised I haven't seen anywhere else, as it is quick and efficient, easily opened with one hand and closed with two. In short, the team at Saddleback have scoured the world to find the toughest and most functional materials and designs, bring them back, and put them to use in this bag.