I have 2 Gregory hydration bladders for sale.
Gregory discontinued them a couple years ago...
I believe they are both 3 liter capacity.
Only used a few times each, only carried water in them, cleaned after each trip.
Looks like the one here, but 3L. http://www.frontcountry.com/site/gregory_reservoir_70
One of them is missing a bite valve, but any of the after market bite vales by Platy or Camelbak will fit.
New they were over $30 each
I am asking $10 for the one with the bitevalve and $7 for the one missing the valve. Shipping is $3 each. OR $20 total if they go together to their new home!