Two architecture and design students from Vienna's University of Technology have designed a cargo carrier for cyclists that would nicely match the cardboard bicycle and helmet. The cardboard Packtasche offers cyclists a cheap and convenient way to carry their groceries.

Philipp Moherndl and Matthias Lechner initially created the Packtasche for the "Cycling in the City" competition and the idea grew from there. The carrier is currently being marketed both for individuals and for grocery stores to hand out instead of plastic bags.

The Packtasche – which translates as Pack Bag – is stored in flatpack form, and assembles quickly, with a printed graphic on the cardboard explaining which parts to fold. It attaches to a bike's existing luggage system and is made from easily-recycled 5 mm (0.19 in) thick cardboard. When assembled, it measures 54.5 x 42.5 x 2.5 cm (21 x 16.7 x 1 in).

Moherndl and Lechner state that the Packtasche can handle a total load of up to 10 kg (22 lb) and be used multiple times, and can also be carried around the store using the hand holes at the top. Whether or not it would be able to withstand heavy rain or even an unnoticed leaky milk carton without disintegrating and spilling your groceries on the road isn't clear.

Source: Packtasche

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