I envision a business that sells several kinds of foods and delivers them to your house as a 5kg package. Inside that 5kg package you can divide the weight however you want, and you pay the same price. Obviously there should be different package prices depending on the kind of food/ingredients inside. For example:
-Cheap pack: includes essentials like rice, quinoa, pasta (all of them with different kinds), flour, beans, veggies and fruits.
-Medium-cost pack: includes ingredients like cheese, meat, fish, nuts, avocados, chocolate.
So you would order a pack and you could choose what's inside. For example i could order a cheap pack with 1Kg of white rice, 1kg of basmati rice, 500g of quinoa, 500g of spaghetti, 1kg of beans, 1kg of flour. This would have always the same cost independently of what I order, and would be delivered in a 5kg package to my home. I would avoid buying and carrying those heavy, everyday ingredients, home. The price would be the same if I decided to compose my pack differently, and the total weight would always be the same.