Two 4-Ounce Wrist Water Bottles, Adjustable Strap - Joggers, Gym, Cycling, Event. WRIST WATER BOTTLES : This package includes two bottles so you have one to share with a friend, or an extra so you can use one while one is being washed. STRAPS : This hard-shell plastic bottle straps onto the forearm in a comfortable, non-obtrusive manner, and holds 4 ounces of water or sport beverage to carry you through your routine. ADJUSTABLE BAND : It has a removeable elastic adjustable band with velcro closures, and features a sport bottle cap with a protective cover. TO KEEP WATER : Here's a nifty way to keep some water with you without having to worry about how to transport it comfortably. SIZE : Overall size of the bottle is 3"W x 4"H (to top of cap), and stands approximately 2" off of the wrist.