I made this bag for a trip that required me to max out my carry-on capacity. The goal was to pack for a trip that consisted of six days in Austin, TX (fairly warm) and five days in NYC (fairly cold). This bag works well when fully packed, but loses it's shape if it's mostly empty. It's a roll-top, but you can access everything via a front U-shaped zipper. There's also a large pocket on the front, and two stretch pockets on the sides.