This project shows a way to bring the groceries from the cash desk in the supermarket into the house. To do so, I designed a stable shopping cart that can be carried on the rear rack of a bicycle. The wheels can be folded down to use the cart at standing height. Beside shopping cart it can also be used as a child stroller with room to store things. No modification at the bike is necessary to use this cart in a simple and versatile way. Simple, because you can easily take the cart on and off the bike. Versatile, because you can think-up many applications. The wheels are nearly 20 cm or 8 inch, so you can drve with ease on streets and sidewalks. Also low thresholds are no problem, that different from the usual shopping cart. The container is made from 9 mm or 0,35 inch thick multiplex board, glue'd and nailed together. All parts of the cart you can buy at the local diy market. I used the castors of an old rollator. The weight of the cart is 11Kg or 24,25 pound. The volume is 50 liter or 13.2 gallon. A building plan, an instruction video and many photo's are making this project easy to replicate.
Step 1: Building material
I like working with wood. It fits in well with this project. You can buy it in the local DIY shop and you can edit with common tools. I took a 61cm by 122cm or 2x4 foot multiplex board. See picture 3. Birchwood 8mm or 0.31 Inch at the outside and the stronger 9mm or 0.35 inch standard multiplex at the inside. See picture 4. Now we can start drawing the sizes on the board.