Features Enter your model number above to make sure this fits. P.when("RPPStripeRendered").execute(function(stripeData){ if(stripeData && stripeData.state){ switch(stripeData.state){ case "result-found": document.getElementById("replacementPartsFitmentBulletInner").innerHTML = "This fits your "+stripeData.item+"."; document.getElementById("replacementPartsFitmentBullet").className = ""; break; case "no-result": if(stripeData.showBullet && stripeData.showBullet !== "0"){ document.getElementById("replacementPartsFitmentBulletInner").innerHTML = "No information found for this part for "+stripeData.item+"."; document.getElementById("replacementPartsFitmentBullet").className = ""; } break; default: document.getElementById("replacementPartsFitmentBullet").className = ""; } } }); Breathable tensioned mesh on the back is anatomically shaped for increased comfort AirZone cutout space on the back gives more breathable space Hydration compatible inner pocket for reservoir and exit ports for hose Tip Grippers with TPU cross grip for poles with spikes and a pull-out elasticated loop for poles with rubber cap Centro Adjustment System is adjustable for customized fit Description Product Description Whether you're heading out for a day hike through the backcountry or a minimalist overnight trek, the Lower Alpine Airzone Trek+ 45:55 Pack gives you options for carrying everything you need. Featuring an expandable floating top lid that gives you an extra 10 liters, the Airzone Trek+ 45:55 Pack is constructed with an advanced AirZone back is cut out for more breathable air space, and the back system is made of a breathable tensioned mesh that not only reduces weight, but is anatomically shaped for excellent comfort. The advanced Centro Adjustment System means you can customize the adjustable back system to fit your back, and an AdaptiveFit hip belt and harness offer extra comfort even on uneven terrain. Plenty of pockets make for sensible storage options like the hip belt pockets, large stretch mesh front pocket, bellow side pockets, internal zippered pockets, and a unique lower entry pocket with zip-out divider for excellent organization. The Airzone Trek+ 45:55 Pack is hydration system compatible with an internal pocket to hold your reservoir and exit ports for your hose. You'll have a comfortable carry with the sternum strap with whistle and side compression straps that stabilize your load. The Airzone Trek+ 45:55 Pack also features an innovative Tip Gripper that holds your trekking poles in a TPU cross grip for poles with spikes and a pull-out elasticated loop for poles with a rubber cap. Finally, there's an ice axe loop and plenty of lash points for additional gear sto