Diapers are just the beginning

It’s easy for kids and even easier for adults. Keeps stuff cold better too. Just make sure you don’t get the cheap ones that may have lead in them.

Buy one of those refilled cartridges from your favorite office supply store or refill the ones that you already have.

How about neither.
Try a reusable bag. You can use them not only for groceries but your kids can use them to easily cart all of their sports equipment to practice.