Lowe Alpine

Cholatse II 65:75 Backpack - 3965cu in

It's definitely possible to spend four days in the desert without any gear, but if you'd rather be actually prepared than hope Gaia shelters you with her love, the Lowe Alpine Cholatse II 65:75 Backpack is a winner. Maybe most impressively, the Cholatse has three different access options: top, front, and bottom, so you'll be able to find whatever you need, no matter where it is in your pack. If you'd rather, strap your gear onto one of the many external options, including the front Spider Plate bungee and let the air mesh backpanel, AdaptiveFit shoulder straps, and padded hip belt take the pressure off. 

There are also plenty of handy smaller features, like a stowable ice axe loops, trekking pole loops with tip grippers, and an included rain cover. Stretch pockets on either side keep your water close, and hip belt pockets do the same for small snacks, a knife, or a compass. The fabric's tough, too, so you won't walk through a pricker bush and find out, 3 miles later, that all your gorp and socks are nowhere to be found. Just Gaia's way of feeding and clothing the squirrels, apparently.