I've owned a mid-sized RKA tankbag (strapmount), the Tourmaster Tri-bag, and a MotoPak (magnetic, can't remember which model but it's the bigger one). The RKA was okay, the Tourmaster offered a lot of flexibility and was *very* well constructed but was just too big for my needs, so now I have the Motopak. It's a little smaller than the bottom part of the Tri-bag, yet bigger than the upper part, it has a front pocket and two side pockets, and the map holder will fit 8 1/2" by 11" paper (important for those of us with poor eyesight and no GPS...). Build quality doesn't measure up to the Tourmaster, but it costs half as much.