This bike bag has enough space for long rides, holds a lot of stuff i.e phone, battery, wallet,bicycle repair tools, small tire pump, etc. , , Perfect compatible with Cellphones Below 6.5 inches, Made by PU material and high sensitive TPU film window helps you use cellphone easily while riding, Great way to see your activity while using maps on a ride, Sun Visor on the top helps you watch phone screen clearly, 3 magic straps make it firmer on the handlebar and is design for quick release and installation