Waterproof: 100% waterproof thanks to TPU-coated fabric with welded seams. Quick and easy to close, the core of the backpack repels water and moisture even in the toughest conditions. Anti-theft system: With a locking system, the main compartment of the backpack can be secured with the included combination lock and attached to a fixed object. This deters opportunistic thieves and pickpockets. Smart Strap System: When the backpack is stored in a locker or trunk, or transported on a rolling suitcase, the Smart Strap System allows the shoulder straps to be tucked away on the back of the bag. Smart Pockets: Integrated pocket in the shoulder strap for storing credit cards, ski passes, etc. Additionally, it features a "secret pocket" on the back to keep valuables well protected from pickpockets.