I bought this for a 50 mile race, and it was exactly what I was looking for. Stacked my extra battery and phone right in front of me on my handle bars and held them tight throughout the race! It offers no water protection, but that wasn't a part of my search criteria when buying this. I'll update later with durability, but it seems to be sturdy upon initial use. Would recommend if you are looking to mount both phone and extra battery power.