Please note, this is a NWOT pack but DOES NOT INCLUDE THE DAYPACK (which does come with the pack when purchased new). It is compatible with the Osprey Daypack, which can be purchased separately. 55L refers to the combined capacity of the large bag (listed here) and the daypack (which is not part of this listing). The bag for sale has a capacity of 40L. Black, O/S. Despite minimal weight, this women's specific, full-featured pack includes backpacking features from more technical packs-like fine-tunable torso adjustments, load-lifting LightWire frames and breathable harnesses/hipbelts-blended with practical travel functionality. Internal organization has been optimized for travel purposes and rugged compressions straps keep your carry tight and stable whether you're bringing your whole kit along or slimming down for excursions. Main pack (what is for sale here) meets most domestic carry-on requirements. Features Adjustable torso fit Large panel zip access to main compartment Lockable sliders on main compartment zipper Dual front compression straps Padded top and side handles Stowaway backpanel, harness and hipbelt Two internal compression straps hold contents securely Internal front flap zippered mesh pocket Internal side panel zippered mesh pocket External Gear Attachment loops