The many years of prototyping different bar bags has paid dividends for Wolf Tooth Components. Their bar bag is everythign you could possibly want in a clever, well thought out pacakge.
You can use the bar bag to store just about anything too, Nutrition, Phone, Wallet, spares, anything you want really! It's designed specifically for single handed operation, so you can grab what you want without slowing down. Flip it open with one hand, then just the wind pushing on it is enough to close it back up. The combination of a magnet and velcro ensures that if you do take a tumble, all your goods won't eject down the hillside.
It's compatible with any Flat Bar Bike where your've got more than 17-18cm of clear space between the stem and anything else. You'll also need a stem that is at least 50mm long.
Secure, easily accessible bag
Clear Lid so you can see what you want before opening.
Trapazoidally shaped to fit on the side of the stem while still allowing enough room to pedal without your knee hitting it.
Provided with a bumper to space away from the stem if running a GPS/Computer on the stem.
Weight is just 98g each and Dimensions are 16 x 7 x 5 and 7cm deep giving .6L of capacity.