I keep this tucked in my kayak's rear hatch and barely notice it's there until I need it. For something so compact, the bag throws out plenty of line and the wedge shape keeps it from rolling around under my seat.
It fits behind my seat like it isn't there, which is genuinely why I actually carry it now. That said, the bag is so small that repacking the rope takes real patience, and 50 feet of line feels tight in it.