New Hydration And Misting Backpack, $259 In The Store! Hydration and misting back back: 2 in 1 backpack. We are blowing out our Version 1 (V1) back packs!! Version 2 (V2) sells for $259, but you can get a V1 here for just $99 What's the difference between the two versions of the Extreme Mist back pack? The V1 backpacks have a good motion range on the sides, but V2 are even more adjustable. The V1 sides are elastic material that stretches, whereas in V2 we switched to a dual Z strap configuration with LOTS of adjustment potential (see pic). V1 also has our generation 3 pump in it that operates only with the included remote, whereas the Gen 4 has the remote with an on/off power button on the pump itself. Both are minor changes, but we thought it important for our customer centric company. That's pretty much it! So get an amazing deal as we clear out our old inventory of these hydration packs. The packs hold a 2 liter reservoir that you can drink from AND engage the misting from, at the same time if you want. Plus they are so feature rich that they will be loved by all outdoor enthusiasts. Great for use in running, hiking, biking, camping, bouldering, mountaineering, kayaking, sailing, boating, skateboarding, rollerblading, skiing, crosscountry, etc.