Pacsafe StuffSafe 80L
Here's what other sites are saying:
When you finally arrive at your destination after a grueling day of travel, throw your biking gear, backpack, or climbing gear into the PacSafe Stuffsafe 80L Stuff Sack, lock it up, and go get a well-deserved meal without dragging your gear along. This handy bag combines a waterproof stuff sack with a lockable, slashproof, stainless steel eXomesh Ultimate exterior for secure and watertight storage. The Stuffsafe works great for leaving dry clothes at the river take-out, securing your bag when you leave the hostel, or leaving your gear outside when you head into a restaurant or museum. The bag also includes a waist and shoulder harness for backpack-style transport and a folding storage mat for when youre back on the go.