Strong Buckle Design:. Comes with 4 velcro straps, three of which can be hooked to the bike's cup holder mounting position to keep the bag securely installed on the handlebars or top tube. The drawstring keeps the cup securely in the bag and won't fall off on bumpy roads. [The bike cup holder is flexible enough to fit dozens of styles and sizes of bikes, so you can install it anywhere on the handlebars. It is suitable not only for cruisers, mountain bikes and road bikes, but also for scooters, wheelchairs, walkers and anything with handlebars. Large capacity Most cups and bottles 12-40oz water bottles fit this water bottle bag perfectly, such as sports water bottles, stainless steel water bottles, coffee mugs, beers, soft drinks, etc. alcoholic. There is a mesh pocket on the front for you to put your phone, sunglasses or keys inside for easy access. High Quality Material:. Made of waterproof and tear-resistant 600 Oxford fabric with film and PEVA, which makes it lightweight and durable. The bag has an insulating layer inside to keep your drinks cool in summer and your coffee hot in winter for short hikes. Easy to mount:You can always find a good place to mount this securely mounted on the handlebars. It comes with 4 adjustable velcro straps, you just need to wrap the velcro straps around the cup holder and attach it to the handlebar. No tools are required.