RentaGreenBox manufactures plastic moving boxes from recycled trash found in landfills. When you’re moving, just tell them how many boxes you need. They deliver, then pick them up after you move. In trucks powered by biofuel, no less.
Not only is this way environmentally cool, they claim it saves money. For example, you can rent 50 boxes (in your mix of three sizes) for $199 for two weeks. That’s probably a savings over the cost of 50 cardboard boxes in mixed sizes. Of course, you don’t get to keep them. But they are made of hard plastic and have carrying handles, which makes them better than cardboard. For one thing, they’ll stack much easier.
This is a genuinely innovative idea. Sue & I have moved three times in 28 months. Hard plastic moving boxes that you can rent are definitely something we’d consider when moving.