Of all the commodities I can think of that are easy to buy, safe to store, have a long self life and are likely to go up in price in the next few years, granulated cane sugar looks more attractive every day. Over a year ago, I started buying a bag of sugar (whatever was the best price per pound), whenever I went to the grocery store. It was common for me to find a 4lb bag of a well known brand like C&H on sale for $1.50. These days, I'm lucky to find a store brand 5lb bag for $2.89. So in a little over a year, the retail price in my local area has gone from .375 per pound to .578 per pound. I expect both the price of sugar and retail sales tax to go up.
Granulated cane sugar has an almost indefinite shelf life, as long as you protect it from moisture and odors and it is stored at about room temp. Besides my own family's use of it in the future, it seems like an easily identifiable, easily divisible, fairly durable barter item. Think of all the things sugar can be used for. Salt is of course an attractive item to store also. But sugar can be fermented, distilled and used to make alcohol in a worst case scenario
