High-Quality Heat Insulation Material:Our bike cup holders are made of oxford cloth and insulated thick aluminum foil material with waterproof and heat insulation! Capable of keeping your drinks cool on hot days and warm on cold ones. At the same time, the cup holder also has an outer mesh pocket, which can hold small items such as keys, cards, earphones, cash or coins. Self-Adhesive Tape & Drawcord Design:The adjustable self-adhesive straps are widened and reinforced to securely attach the cup holder to various vehicle mounts. The top drawstring closure quickly opens/closes to protect water bottles and phones from dropping. Keeps the water bottle stable even on rough roads. Hold The Water Bottle Firmly:With two-point fixing design, it is installed on the bicycle handlebar, the self-adhesive tape is reinforced with stitching, which can hold the bicycle cup holder tightly on the rack, suitable for anti-roll bars with a diameter of 1 to 3 inches, and will not affect the ride stability. There is also a drainage hole at the bottom of the bag for easy cleaning and drainage. Fits Most Bottle Sizes:The biggest advantage of this bike water bottle holder bag is that it can accommodate containers of different sizes. Holds slim 12-24 oz bottles up to 3 inches in diameter, suitable for all types of water bottles, sports bottles, feeding bottles, coffee mugs, plastic feeding bottles, beer cans and more. Multifunctional Application:Not only suitable for bicycles, the bike cup holder handlebar can also be installed on electric scooters, mountain bikes, electric bicycles, baby carriages, wheelchairs and other means of transportation. Suitable for hiking, camping, gym, traveling and other outdoor activities. Makes a practical birthday gift for family and friends who love to ride.