Form Follows Function
Instead of being shaped like a cone or a triangle, this bag is shaped like two rolled-up road tubes. Not surprisingly, it fits two rolled-up road tubes very well, along with two CO2 cartridges, and inflator, a tire lever, and a small multi-tool. It is simple, functional, and unobtrusive. Minus a star because its a little fiddly to feed the shorter end of the strap behind the saddle rail. an extra inch or two would be useful.