A flexible bottle holder that weighs just 45 grams and holds most bottle sizes.Staying hydrated while you exercise is crucial. The Topeak Mono Cage makes this easier by providing a secure and easily accessible space for your water bottle while your cycle.Ultra light - won\'t weigh your bike down.Durable engineering-grade plastic constructionFlexible rubber insert \' to secure the bottle.Won\'t corrode or scratch bottleVersatile - holds both small and large bottles.Includes adapter for alloy bottlesWeight: 45g