Joined: Jul 2007
Posts: 8,603
Likes: 3,532
From: South shore, L.I., NY
Bikes: Trek Emonda SL7, Cannondale Topstone, Miyata City Liner, Specialized Chisel, Specialized Epic Evo
I use it when mt. biking as I don't get crud on the bite valve the way I do on a bottle.
I don't typically use it on a road ride unless I'm uncertain where the water breaks are or I need to carry more then 2 bottles worth.
I never use it commuting as my commute has water fountains along a board walk in NYC where I can re-fill a bottle.