Before taking over your shelves and your annual trek, all Klättermusen backpacks and apparel are tested. To ensure their durability, first of all, tests are carried out on the fabrics and materials under extreme conditions and then again once the backpacks are assembled. That is why Klättermusen bags are made with high-quality materials such as: recycled polyamide, polyester, nylon, Kevlar®, Econyl®, Levitend® or Retina® (not the one on your screens). And, if you want to know whether Klättermusen bags are hard-wearing? The answer is yes. With Klättermusen, you don't have to worry about a seam splitting when you're hiking, or the shoulder strap coming undone as you're climbing