Pick your frame bag size. These bags are specially designed to fit and protect anything you want to carry. They fit some electric bike batteries, snacks, phones, wallets, large water bottles, accessories, and more. These bags are the additional waterproofing systems that will survive the weather you give it! They are made with only the best and highest quality material to endure years of use and abuse on any road anywhere in the world. Small: Length: 17 in / 43.18 cm Height: 6 in / 15.24 cm Medium: Length: 19.5 in / 49.53 cm Height: 6 in / 15.24 cm Large: Length: 21 in / 53.34 cm Height: 6 in / 15.24 cm FOR SIZING CONFIGURATIONS, PLEASE MEASURE YOUR TOP TUBE JUST UNDERNEATH WHERE IT MEETS EACH BAR. THAT DISTANCE WILL DETERMINE WHICH SIZE YOU NEED TO PICK FOR YOUR FRAME BAG. FOR EXAMPLE, IF THE DISTANCE BETWEEN BARS UNDERNEATH IS 20.5 INCHES, ROUND UP TO THE NEXT SIZE WHICH IN THIS CASE WOULD BE A LARGE.