Certainly an innovative idea using old Nike scraps for bumper plates!! Would be hard as there are a lot of competitors, however what differentiates this product is that we are recycling old products and helping the environment!
I think this is a really good idea especially now that supermarkets (in Australia) are phasing out the idea of using plastic bags. You mentioned that you will partner with other retail markets to replace their plastic bags.
This idea is definitely scalable, so have you thought about who will assist you/your business in expanding the product out to other countries. E.g. Who will help get the product from the manufacturer to customers internationally?
Nice work on being chosen as one of the Top Ideas. Great to see you targeting those communities who feel excluded. Seeing that your idea is making an improvement to such communities is a great achievement, well done!