The YOGA SAKS unique feature is the backpack style bag. Whether one's walking around town, biking, hiking or just on the go, you can take your YOGA SAK everywhere. The SAK has adjustable straps that will fit all body sizes and shapes and has many pockets for your keys, wallet, change, etc . The SAK even comes with a built-in water bottle holder and a compartment in the rear to carry your yoga block, towel, shoes, ipod, etc. The YOGA SAK is stylish, functional, durable and is well priced.