The Doubletrack 80L (aka as the Doubletrack 28") is the ultimate answer to compatible, flexible, roller luggage combining an 80 litre main bag and a detachable day pack. The wheels and handle on the main bag stow or retract when wheels are not an option and the complete technical pack suspension system comes into its own when carrying the bag is more optimal on uneven terrain or dodging commuters in busy urban environments. A useful detachable 16 litre day pack is included. Designed with an array of innovative, technical features, the Doubletrack 28" is the largest travel bag in the line that transforms into a backpack.