These are very durable and hold up tight as I drag my butt around the trails. The one on my seatpost contains a 29" hose, a small tool kit and a CO2 valve. The one on my top tube contains two CO2s, two tire tools and my phone. The one on my top tube never falls off, but sometimes it slips and I have to correct it. It has nothing to do with the bag because I average 10.9 mph on rough TN MTB trails. I fully support them and recommend them to anyone who buys them if you are looking for an alternative to a backpack.
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