A plastic shopping basket.
The user always has the basket on his lap when he shops. He gathers goods in the store, pays the cashier, and returns the goods to the basket, which he puts on the back seat of the car.
To avoid misunderstandings in the shops he wrote “private basket” on the basket.
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In Sweden similar styles are available at e.g. Witre, www.witre.se (customer basket) (last checked May 2017).
This tip is from 2012