Made from superlight and durable nylon ripstop and featuring a flexible, cooling Backbender back panel and air mesh shoulder straps for ventilation, the Timbuk2 Especial Vuelo Daypack is designed for everyday cycling in the city. Flap top main compartment can also function as a rolltop for better weather resistance. Internal waterproof drop liner keeps your packs contents dry. Napoleon side entry allows easy access to the main compartment. Organizer keeps your pack neat and clutter free. Dual stretch side pockets for carrying a U lock or water bottles. Superior ventilating and flexible Backbender back panel. Ergonomic air mesh shoulder straps with removable sternum strap. Reflective hits and a loop for securing a blinky bike light light not included help keep you visible in low light. Internal slip pocket holds most laptops up to 15 in..