Bopworx double bumperthe double bumper from bopworx is the ideal solution for traveling with multiple bikes on a rear or hitch car rack the double bumper has two faces and rotates in the middle allowing you to align each side at any angle each side has a soft yet durable rubber contact and straps securely on each side with our hook and latch system it creates enough space to prevent two bikes from damaging each other while on the road in a dual bike bagcase or even while simply in storage