The StrapPlate can be mounted on an AdaptRail but also directly on your frame where possible. Think of the mounting points on a front fork or on your down tube. The slots on the StrapPlate allow you to strap a wide or thin object. You can strap an extra water bottle or an inner tube, but also a banana or a can of coke. The inside of the StrapPlate has been treated with a friction layer so that the objects will stay in place. This is a very useful accessory for people who want to carry more things on their bike in an efficient way without taking up extra space in their bag or back pockets.