Yup materialize your savings for a 2% a year compounding tax free return.

Urban dwellers might be more limited but for people who have unused or underused space, this is a way to get a return on that space.

Salt, granulated sugar, powdered sugar, brown sugar, socks, underwear, under-shirts, vinegar, soap bars, toothbrushes, razor blades, feminine products, toilet paper, paper towels, napkins, trash bags, freezer bags, sandwich bags, foil paper, parchment paper, plastic wrap, wax paper, candles, matches, diapers, pet supplies (litter, etc.), gardening supplies, building supplies, repair supplies, medical supplies, fire wood, wood pellets, long lasting appliances and furniture, kitchenware, dinnerware, sheets and pillowcases, blankets,comforter,bedspreads, Maintenance, renovations, Efficiency upgrades.

Some liquid soaps and chemicals have a limited shelf life of just a couple of years so it might be better to avoid unless you know the shelf life. Also be careful buying more than you need which can lead to waste. Be careful being wasteful just because you have lots of stuff at home. Buying alcohol ahead of time in bulk works if you have the discipline not to drink more. Also to get a good return you need to use the full life of your stuff before replacing from your stash, not replace early because it's right there.

There is also a macroeconomic benefit to this approach. It can get the economy out of keynesian recessions when people save by buying.