Originally Posted by madcow_number_6

I'm not so sure about the new ones but my 2 year old Topeak MTX expandable trunk does fit on other racks. It has these handy little velcro straps built into the corners for in-case you need to use it on a non Topeak rack. Of course this means it won't just slide on and click into place, you gotta fidgit with it for a bit, but it works. I suppose they would also be good for stabilizing the bag to the Topeak rack for when I'm taking the mtn bike trail home in the summertime. But I never remember to do that and in 2 years of commuting with this bag the slider and clip hasn't failed me yet. Good stuff.