They fit snug and tight, and I have built my own roof rack which I have placed on top of these bars and secured the 3xi6 wooden box on top. Its your normal micro USB charge port. It looks great and wont roll out, but the seller takes forever to ship it and the price is not that good for 1. Took this cargo storage bag on a trip to tbe Sierra Nevada mountains and it snowed, rained, and snowed. Great arch support and the sole is soft to walk on. Great for around the house or yard. they are a bit small. Like many people one of my feet is half size off from the other so this style accommodates that issue easily. I can now happily say I wore them all around London this weekend and walked over 5 miles with no blisters or sore feet! These are comfortable all day.