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 = ""; } } }); This expandable pack is perfect for 3+ hours of any adventure Antidote Reservoir features Quick Link System, easy open/close cap, lightweight fillport, dryer arms, center baffling and low-profile design Key Pack Features: Ultra-light materials, center expansion zip, front and back reflectivity, safety whistle Designed to carry extra layer, food, headlamp, trail maps, compass, trekking poles CamelBak Got Your Bak Guarantee: If we build it, we'll Bak it with our lifetime guarantee Description Product Description Like all of the Octane series packs, the Octane 18X is made of ultra-light materials perfect for adventure racing, trail running or XC bike riding - anything where you need to move fast and minimize weight. Features a vertical zipper that opens to expand your cargo volume or zips up tight for a snug, low profile. Plus you get two additional stretch pockets on the front and two stash pockets on the waist belt and harness to keep your essentials always close at hand. For safety we've added reflectivity front and back and a whistle on the harness.