Originally produced in a two-tone design, Bijl worked with frequent collaborator – designer Bertjan Pot – on a series of six-colour versions released in 2017.
We're giving readers the chance to win one of four new colourways of the multi-coloured shopper produced for the partnership with Hay, including the punchy Volvo palette of yellows, green and pale blue panels.
Designed to "replace all other bags", the Six-Colour Bag can carry more than 20 kilograms in weight.
It is made from reinforced Ripstop nylon – a lightweight and durable fabric commonly used to make kites. The material is bluesign-certified, meaning harmful substances are removed from the manufacturing process.
Built to last, a hydrophobic, water-based coating protects the outside of the Ripstop nylon, that is less damaging to the environment than a conventional polyurethane coating.
Bijl's initial idea for a reusable shopping bag came from a desire to reduce the wasteful production of single-use plastic bags.
Frequently seen on the streets of Bijl and Pot's home city of Rotterdam, the long-life bags have become a local icon since their inception, according to the studio.
"We meet people in our store that still use Shopping Bags that are over 10 years old. We have a care and repair service, so if anything happens to your bag, we fix it for free," said Bijl's studio.
Next year will mark 20 years since the first bag's production. Bijl's original two-tone bags are still sold today, alongside other products such as backpacks and pouches.
The bags can be bought from selected Hay retailers and Susan Bijl stores. Four winners will each win a Six-Colour Shopping Bag of their choice.
Competition closes Tuesday 11 June . Four winners will be selected at random and notified by email, and his or her name will be published at the top of this page.
Photography is by Jan Bijl for Hay.