REI Outlet offers the CamelBak Flash Flo LR 1.5 Liter Belt Hydration Waistpack in Black/Blue or Amethyst/Coral for $44.73. Opt for in-store pickup to avoid the $5.99 shipping charge. That's the lowest price we could find by $4, although we saw it for $15 less in January. It features two compression straps and an adjustable belt buckle.