Customize how your hike feels with the Aerios 35 Backpack. Its patent-pending interchangeable harness system — with three sizes of hipbelts and shoulder strap options — allows you to personalize your fit, so weight is evenly distributed through your hips and shoulders. Plus, the lightweight, durable grid pack fabric sheds light rain and stands up to all the drops, drags, and snags a pack encounters on the trail. What's been updated: Updated with a FC0 DWR finish for a lower footprint. Need a different size? Try the smaller Aerios 18 Backpack .