Product Description: For those ready to make the leap to self-supported, the Synapse is packed with performance and comfort-enhancing features to tackle intense, all-day and multi-day adventures with ease. The Open-Air, suspended backpanel allows air to circulate between the pak and yourback. Breathable shoulder straps and waistbelt handle the heat while the water-resistant fabrics, zippers, and removable cover stave off rain and snow.