A Winner, With One Exception
I've tried a number of reservoirs for my bike pack and this is by far my favorite.
Bite valve works as advertised, the 3L size is enough for even three or four hour rides, and filling this reservoir is simple.
Construction of the hard plastic panel insert which sits against your back. This panel appears to be sewn and sealed to the inside of the reservoir in a manner that allows for eventual leakage. After about a year of off and on use this reservoir began to leak at the seams, fast. A little Gorilla glue plugged the seam leak for a bit until I could purchase another reservoir. We'll see how the replacement does after another bike season.
I'm a fan, minus the back panel leakage.