The prologo u bag 41 is a great saddle bag one of the most secure on the market this saddle bag is a great idea using a clip that is located on the back of your prologo saddle you can mount the bag for a fast fitting secure fit this saddlebag is designed to take a little more than its smaller brother you can fit phone wallet spare tube multi tool and maybe a co2 cartridge if youre an expert packer this bag is perfect for rides where you only really need to take the essentials but need