32.881678,-111.854982,Francisco Grande, Casa Grande, Arizona,
USA

I used
this two liter water reservoir in my Wills Wing Covert harness at the Santa
Cruz Flats Race.

I got mine (and an extra one) at
REI.

It was by far the best reservoir that I've used. The rigid back plate was
particularly important. Water came out of this reservoir more easily and
consistently than any other one I've tried. It gets great reviews and the REI
people recommend it.