Sandy Stacey wrote:I second the glass jars and vacuum seals.
I also store dry goods in vacuum jars. For anything that would oxidize, such as nuts, or get stale or soggy, such as crackers, a vacuum acts like a stasis field, preserving it almost indefinitely. No air means no oxygen, moisture, bugs, or mold.
When I first got a vacuum sealer, I used it for packaging meats for the freezer. Used properly, it does a really great job at this, and I have not dealt with freezer burn ever since. Eventually I got some mason jars, and then realized what a game changer vacuum storage is. All of the dry goods that I used to date code and store in the freezer, only to eventually throw out the remainder after a year or so, could now be stored indefinitely in vacuum jars. And now I just write the year, only for reference, because I don't have to throw any of it out.
Any dry good that goes bad over time can benefit from this. Powdered milk stays pristine white, instead of yellowing through oxidation. Nuts never go bad. Coffee smells the same as when you first cut open the vacuum package. Spices last forever. Baking powder does not lose its efficacy. Any seldom used ingredients can be kept in like new condition.
Some soup recipes involve pouring all the dry ingredients into a pot, adding water and then simmering. You can premix the dry ingredients, and vacuum seal them in a jar, for when you are in a hurry for some soup.
Flour mixes for pancakes or biscuits can be premixed, and vacuumed.
Any dry good, with a true expiration date can benefit from vacuum storage.
There are tricks I have learned or come up with over the years.
Tapping on lids tells you the state of the vacuum. A dull thud means you seal was lost. A clear note means everything is good. I check my jars periodically for vacuum.
A good vacuum negates the need for lid rings. I just buy the lids now, as I have excess rings.
Lids can be reused many times, but gaskets will wear out eventually, although I have some I have been reusing since I first started. The newer ones don't seem to last as long.
Foodsaver makes mason jar sealer attachments. Their regular mouth sealer needs to be shimmed to work reliably. Put a lid on the jar and then stack another upside down, over it. Then seal the jar. The shim keeps the lid pressed down so that it seals properly when you release the vacuum.
The jar rim and lid gasket must be scrupulously clean. Even the tiniest bit of dust can cause a very slow leak. This can be a big problem when sealing flours, as drawing the air out, creates dust clouds that get under the gasket. I solved this problem by poking a vent shaft, down the center of the flour with a chopstick. Air gets out through the vent shaft, and no clouds of flour rise up to foul the seal. My vacuum sealed flours no longer leak.
Breaking the seal on a mason jar can be difficult, because you don't want to damage the lid. The easiest method I found is using a chopstick, specifically the square handled cooking chopsticks. I put the chopstick tangential to the jar, with the square end underneath the rim of the lid, and spin the jar around until the chopstick is wedged between the rim and the jar thread, and lever the chopstick to lift the lid enough to break the vacuum. No lids are harmed doing this.
Non mason jars can be vacuum sealed through one of two methods. Chamber sealing, or punch and tape:
Chamber sealing involves using a larger container to vacuum a jar or jars inside. Wash and reuse any food jars that have gasketed lids, lightly close the lids, and vacuum them. Tap on the lid to be sure.
Pump -N- Seal sells a kit for vacuum sealing any food jar. It comes with punch, pre-cut squares of sealing tape, and a vacuum pump that goes over the tape covered hole. The pump is operated until the air is evacuated, and the tape seals the hole as the air tries to rush back in. Their kit is handy because it is hand powered, and works anywhere, but you can roll your own if you like. A metal push pin acts as your punch. Electrical tape is thick enough to create a hermetic seal. Any adapter for reusable zip lock vacuum bags can cover a taped hole, so one of those can vacuum your jar.
Vacuum storage, either in bags or jars, can be great for preserving almost anything that oxidizes or hydrates when exposed to air. Metal parts will not rust. Fabrics and leathers will not mold or mildew, and moths cannot get to them. Books will stay pristine, and silverfish can't survive without air. Matches will stay forever dry, and your first aid kit items can be individually waterproofed.
You still need to periodically check for leaks.