It makes no sense to split everything in the world. However, for a trekking backpack that doubles as luggage, it definitely makes sense.
The Db The Duplex comes with 70 litres of storage space, is basically a backpack but gives you the convenience of a splitable trolley. Modern aesthetics combined with functionality.
The soft, lightweight ABS rib cage gives the Duplex its unique shape and it retains that shape even if you only fill it halfway. 
The patented Hook-Up system takes weight off your shoulders and transfers it to the wheels instead. The backpack can be easily attached to all Db wheeled bags.

Rib Cage construction
Inspired by the human rib cage, which protects the body’s most valuable organs, Db’s patented Rib Cage construction protects your gear in the bag. The Rib Cage construction is built from strong, lightweight ABS ribs formed as a triple fold structure. This means that conventional padding can be dispensed with. This makes the bag lighter and yet protected all around.

FeaturesThe organisation of hard shell luggage with the carrying comfort of a trekking backpackBased on the iconic duffel lookA soft rib cage that makes the product look good even when half emptyErgonomic carrying system with sternum strapLoad adjusters & aluminium framesExternal storage compartment6 inner compartments incl. laptop compartment100% recycled main materialDurable carbonate coating