The backpack Busquets carts are made of aluminum, PP and silicone materials are poorly weighed, but with greater strength than most you can find in the market. Thus we do not add more weight to that already carried in backpacks. The plastics used (PP) can be recycled and are fit for human contact. We have carts school bags, and small cars for small children backpacks.
Our carts convert backpacks, into backpacks with wheels. But with all the advantages of not being incorporated permanently. Also our carts are foldable so that when not in use occupy minimal space. The wheels made from silicone pads allow perfectly our cars roll while generating no noise.
They have a new support to anchor the bag by the top improving the support, in addition to the 2 lower universal slots that serve the vast majority of backpacks in the market, whether or not Busquets.