The Geigerrig comapny have a rather unique offering, with a pressurized hydration system. This system involves having a bladder with a hand pump (like the kind Dr's use to take your blood pressure on a elbow collar) to pump air into the bladder, squirting it out of the bite-valve.
This is the Guardian model, which I fell in wish-lust with ....
It features a 2L (70oz) bladder (although they do offer a 3L bladder as well) which has fittings for drinking tube and pressurization tube which are both quick-release valved, and offers a slide-top for easy filling and cleaning. Skanky hydration bladders are no-ones friend!
Better yet, they have a variety of carriers for these bladders, all designed to contain the pressure, and give you a secure, continuous pressure water-source.
The fabric of the carrier is a light and rugged 500D Cordura, with PALS/MOLLE strips on top and bottom, six D-ring attachment points for lashing it your pack, vest, plate carrier or what-have you, should you decide to forgo the built in (but stowable) pack straps.
Twin compression straps add to the pressure and stability of your water-load, but the real magic here is the hard nylon "guardian plate" which backs the carrier. This was the real magic for me, as it offers something that I've noted was missing, a slick, hard backing to my hydration carrier. I am very happy with my Platatac Bravo but I found that when on Tough Mudder, crawling through pipes and under netting, and barbed wire, that it caught on occasion, as well as getting in and out of vehicles with it, a slick turtle-back would be a great advantage to both toughness, and drag-reduction.
Couple this with the in-line cyrpto and virus filters and you have a very resilient, functional pressurized hydration system. Hydrate, wash wounds, clean goggles all on the bounce, from a secured and armoured platform!
What's NOT to lust after?