This piece is close to the same size as the large Topeak aero wedge I have, but I can put much more in it including my phone. The other one curves too much which wastes space but this one will let me slide the phone right on top without risking breaking the screen. It also holds 1 700c tube, 2 CO2 cartridges, a CO2 inflater a multi tool, a pack of gummies, an applesauce pack, my wallet and keys. The other one held all of that except the phone. The one feature the other one has that this one is missing is the nice little mesh pocket on the flap. It was nice for containing small items like a presta to Schrader adapter or a mask