Mountain Hardwear Summit Rocket 20 Vestpack - SS16 Nylon OTF (On-The-Fly) Compression System - Keeps your load stable and secure. Can be removed to shed weight. Comfortable Shoulder Straps - Low profile, wide and lightly padded for added comfort and weight distribution. Also shed snow and ice. Easy Access Pockets - Four pockets located on the shoulder straps allow easy reach of essential items. Zippered Main Compartment - Large, convenient zip across main compartment allow easy access of small or large items. Dual Axe Cradles and Mini Daisy Chains - Easy tool and gear carrying setup.