In order to sample the contents of #10 cans they must be opened and immediately at that point the long term food life begins to degrade. There are 13 cups in a #10 can so, if you have 6 or 8 different types of food that you need to practice preparing, a lot of time may pass during this practice time and spoilage of the remaining amount is possible. I get around this problem by opening the cans and immediately transferring all the contents into four, one quart canning jars with an oxygen absorber in each jar. Now I can use one of the jars to take food from for my testing and everyday use while the rest is safely stored in an oxygen free jar to continue its long term storage.
Your probably asking, why do I use a 500cc oxygen absorber in each jar, isn’t that overkill? Yes it is, but here’s why I use that size. I prefer to keep all my preparedness items and methods as simple and uniform as possible, so I stock only one size of oxygen absorber, the 500cc size to use in all my storage containers. If I need let’s say, 1,000cc’s for my one gallon Mylar bag storage I simply use two of them, for five gallon Mylar bags I use eight of them. It does cost a few cents more this way but I find it is a small price to pay for this flexibility and almost all my storage today is in quart jars and one gallon Mylar bags.