The Arundel flip flop cage is a more affordable version of their Side Loader with a twist. As you may know, the side loader is a great solution for easier water bottle use/access particularly on small framers or wherever space is tight. With the side loader, you have to think about what hand you prefer to grab the bottle with and where you plan to install the cage. Not so with the Flip Flop. The top and bottom pieces on the Flip Flop can be ingeniously reversed for a perfect install.