The 26 cm long zipper on the right side so that you can open the bag while driving with his right hand. The size of the volume I guess to 1.2l. I have it mostly a compact camera, repair kit, wallet and keychain.
The 6 cm long Roswheel logo on the left is of a reflective material. But is likely to be too delicate to be for these purposes truly useful.
The attachment to the bike is also very easy. One should make sure that the bicycle frame forms a triangle on the head tube. If the steerer tube should be long and this results in no triangular shape, it could give problems with the mounting, because eventually the distance between the upper and lower pipe is then too large. In my Bergamont trekking bag fits perfectly. The Velcro fastening should match up to a pipe diameter of 5cm.
Here are the pocket Dimensions:
Length: 27 cm
Height: 13.5 cm
Width: 6.5 cm