It's best to buy them split, since split peas don't need to be soaked and cook fairly quickly. They're commonly used to make soups. The Case of 6 #10 cans holds approximately 6.5 pounds/12 cups of split green peas in each #10 can.
Be prepared and have your food storage on hand!
Each #10 can is sealed with an oxygen absorber. If stored in a cool, dry place, beans should last 10+ years. In an emergency situation, boiling the beans in water for 20 minutes will kill any bacteria and will still give you some nutrition.