CamelBak Spark 10 LR 70oz Hydration Pack. The CamelBak Spark 10 LR 70oz Hydration Pack is a women's specific pack that's perfect for light and fast rides requiring a minimal amount of extra gear. This pack features CamelBak's 70oz Antidote Lumbar Reservoir which places the reservoir low and over your lumbar region for enhanced stability and off road comfort. The 70oz reservoir allows hydration for 2 hours plus there's 450 cubic inches of cargo space to hold your tools, tubes, nutrition, and electronic devices. Its highly ventilated LV back panel and Women's Specific Ultra Lite 3D Mesh Independent Suspension harness ensure superb comfort and ventilation while the pack's ultra light materials mean you remain nimble and agile out on the trails.