I’ve used this bladder on two trips but have decided to go back to carrying water bottles.  It was only filled with filtered water in the backcountry and cleaned after every trip.  I never had any issues with the product; it always pressurized properly and never leaked inside my pack.

I’m including several optional accessories, which include

1. power bulb holder which fixes the pressurizing bulb to your shoulder strap for easy pressurizing on the go,

2. Geigerrig Drink Tube, which is an extra tube that you can leave inside your mouth for continuous hydration, with no effort on your part.

Of course, the original drink tube is also enclosed.

Details and specs can be found by searching on Geigerrig Hydration Engine.

Asking $35 plus $5 shipping.