2 backpacks that combine into one travel system. A fully detachable daypack that gives you ultimate flexibility with your travels. Plus, it meets most domestic carry-on requirements with the main pack overhead and daypack as your personal item. - 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 - Removable daypack with lockable main compartment - Daypack features: Mesh side pockets - Daypack features: Laptop and tablet sleeve secure in lockable compartment - Fits most 16" laptops - Domestic Carry On size: Daypack under seat, Chassis overhead