Plastic/Nylon material seems to last a long time and is also quite light. It can be attached to the aero bars in a number of ways. If you are too concerned about your bottle flying out, it can be mounted in a different way and open the bottle towards you. The only thing that can wear out are cable ties, which you can buy at any cheaper hardware store. My wife has used it in two triathlons with no problems, her regular team water bottle fits just right. I'll get one for myself too.
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