Trabag
Tray+ShoulderBag in One! So you can put snacks and Co. at the tray and have the hands free

Solution

The bag is made mainly of PVC. The material also used for the trucks too.
Stability achieved by the case of polystyrene, which is one of the main body in place and to find at the two supports under the tray.

There is a Anti-slip mat, where you can put e.g. an mobile phone without slipping away. And for something to drink, there is a cup holder

The tray can be quickly set up and closed and used as a normal shoulder bag.

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