Features:

*Strong hard-shell. Unlike those cheap trunkbag, which will collaspe when there is nothting inside, this bag with strong hard shell, so that keep you stuff all remain good condition.
* Big capacity. The bag have a 10L capacity when nature status. But if you extend the side bag , the capacity can reach to 35L. No matter for daily use or long trip luggage carry , it can meet all the needed.
*Easy install. The bag adapts velcro to install , it don't need to install by bolts, which not harm to your bicycle.
*Many use way. You can use it as a shoulder bag , handlebag , and trunk bag. Come with single shoulder long belt.