Chrome sure does make some burly fucking backpack. Like, this particular rolltop is Stretch Armstrong. Which one of you guys was the kid that cut your Stretch Armstrong in half to see what he was made of? Anyways, how is this bag can be extended to double in size from a 20 liter pack to a 40 liter pack. Personally, I love the waterproof compartment, the separate laptop sleeve and, of course the reflective strip, which stays chill during the day, but will blaze a reflective Chrome logo at night if someone gets too close to you with their headlights.