Topeak FastFuel Tribag Frame Bag

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5/ 5

Handy bag to keep items like phone, keys, snack(s) or debit card handy.

Not only on a triathlon bike to attach to the top tube, also applies to my gravel bike! It too has a "bottle cage" on the top tube, therefore no need to attach to the stem. I haven't cycled with it in the rain yet, don't know if it's waterproof.