Several years ago I bolted a plastic box to my rear rack and gave myself hearty congratulations for doing so. Reader Berto deserves a Bike Hacks Nobel Prize for his DIY portable shopping cart if you ask me. All text, pictures, and the excellent Youtube video are credited to Berto. The referenced Instructable below gives the blow-by-blow for those with the tools and time . . . me, I might want to order one sometime if Berto opens his own business.
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My problem was to find a solution for easy shopping by bike. How to bring in one go my groceries from the cash desk of the shop into my kitchen? That, without crates, shopping bags, loading and unloading. etc. Everybody knows what I am talking about. For older people it's even harder to do this weekly 'mission' by bike.
Last month I made a prototype of the 'bike - portable shopping cart'. My wife and I tested this cart and it worked well. I made a step-by-step Instructable and a YouTube video of this project. You know it's always eco-friendly to use a bike for transportation.
I hope people realize that this simple shopping solution can be made with material and tools out of the DIY shop in the neighborhood. The four big castors are from an old rollator. They drive comfortly at street and sidewalk and a low threshold is no problem.
The weight is 11 Kg or 24 Pounds and the volume is 50 liters or 13 Gallons. The volume can be more by extending the box size.