Kelty's Catalyst 50 Backpack handles weekend adventures with full adjustability for the utmost comfort. Its PerfectFit suspension adjusts the sturdy back panels to rest perfectly on your lumbar and below your shoulders. This comfortable suspension system also includes lumbar support, dual hollow aluminum stays for stability, two layer padding at the waistbelt and shoulder straps, air mesh at the back panel, and stabilizing straps at the top and belt. Kelty equipped the top loading Catalyst with a main access zipper that opens wide for speedy packing. Hydration compatibility pairs your own reservoir with the Catalyst so you can get water on the trail. There are also multiple pockets for snacks, water bottles, layers, and ice axes or trekking poles.