Restrap Side Release Bottle Cage – Black. The Restrap side release bottle cage allows convenient access to your water bottle by featuring a side entry. This makes it ideal for bikes with compact frames or for when using a frame bag may affect clearances on bottles. With a foldable base it offers the flexibility of being mountable in two different positions giving you the choice to have the opening on either the left or the right side. The cage also has a rubber retention loop which keeps bottles even more secure on rough and bumpy terrain. Adjustable fit means this cage can fit on any bike using any bottle mounts available on the frame or forks.