Gym bag, work bag, school bag, bouldering bag--the Arc"teryx Mistral 16 Shoulder Bag can be just about whatever you want it to be. A roll-top closure keeps water out during the rainy commute, and two front pockets keep smaller stuff like your cell phone and MP3 player separated. Arc"teryx added a plush shoulder strap to help you carry heavy loads when you need to bring along more than normal.