The award-winning pressurized Geigerrig Hydration System allows you to spray water to hydrate, share, clean, cool, etc.--anything you need. The pressurization enables convenient in-line plug-and-play filtration for on-the-go access to natural fresh water sources. When you are done, simply flip your Hydration Engine inside out and place it on the top shelf of the dishwasher for easy cleaning and drying. The RIG 1210, built with 1200 cubic inches of packing space, was made with more care and precision than when your parents made you all those years ago. Its durable 840 Ballistic Nylon material will protect it (and you) from anything you can throw at it. It has more pockets than you have things to put in them. The hidden rain cover will protect your gear when Mother Nature tries to take you down. With the RIG 1210 you'll be ready for anything! (Length 19 inches. Width 12.5 inches.)
Don't forget to buy a filter. This reservoir is filter-ready. Also, you may want to consider buying a bulb holder if you are retrofitting to another pack -- not required, but nice to have.