REI offers the Marmot Sphinx 15 Climbing Pack in Brickstone for the in-cart price of $43.73. Opt for in-store pickup to dodge the $5.99 shipping fee. That's the lowest total shipped price we could find by $14. It features compression-molded and perforated foam back panel, ice-axe loops, an internal hydration sleeve (reservoir not included), and zippered front pocket.