ORTLIEB Commuter Daypack City Backpack 27L With a capacious 27 litre volume and robust waterproof construction, the Commuter Daypack City from ORTLIEB is the perfect backpack for keeping everything well protected on the way into the office or around town. Its roll closure is quick, secure and simple, giving easy access to the contents. There is a padded laptop sleeve on the inside and a zipped pocket on the outside for frequently needed items, along with loops for carrying a U-lock and a rear light if needed. The carrying system and padded, ventilated back panel ensure that the bag remains comfortable even when fully packed and the chest and waist straps keep it stable if used on a bike.