The word “Nimbus” has many definitions. In this case, Nimbus means “Nice, Big, Well Designed, Lumbar Pack”. Nimbus in the Fishpond sense of the word means a big pack with two water bottle holders. Maybe it refers to the lightweight materials and the Air LTE lumbar support that places you in a cloud or aura of comfort. The Fishpond Nimbus is a nice pack that holds a lot of fishing gear. Go ahead, be a nimbus, or wear one fishing.Lightweight, waterproof breathable fabric with 1680 ballistic accentAir LTE lumbar supportIntegrated guide net slotBottom cinch straps for an extra layer or rod tubeLarge zippered main opening with two organization pocketsFront zippered pocket for quick access itemsTwo exterior pockets to accommodate large water bottlesExterior Hypalon®, and cord tabs for gear attachmentTwo water bottle holdersSpecs - 579 cu. in. - 12.5" x 11" x 4"Made from Cyclepond nylon fabric.FREE GROUND SHIPPINGORDER ONLINE OR CALL 865-448-9459Little River Outfitters is a fly shop and mail order company located in Townsend, Tennessee, a gateway to Great Smoky Mountains National Park. We have been family owned since 1994.