Startup I will never get around to:

A store which sells only bulk and fresh food, and durable containers: mesh bags, Mason jars, glass bottles.

Every container, dispenser, and display has a scale, and unlocks with a nearfield chip. Enter the store, tap phone or insert chip card, get a card.

Fill up your cart, stick the card back into the slot, get charged, done. One customer service kiosk for buying back clean containers at 80% of retail cost.