Hey simple solution and better than cans my friend, you can reuse the containers endlessly, and they stay fresher too.
Using this method you can re preserve food where you are according to the food available at the time, and carry empty and therefore light containers
if you need to be mobile:
Pickling, also known as brining or corning, is the process of preserving food by anaerobic fermentation in brine (a solution of salt in water), to
produce lactic acid, or marinating and storing it in an acid solution, usually vinegar (acetic acid). The resulting food is called a pickle. This
procedure gives the food a salty or sour taste.
Now it might not be as modern or taste as you are used to but you can pickle almost anything at all, and when the Glass jar is empty re-use it, for
lots of other things too,
to keep things dry,
to start a fire with the sun and straw,
to collect water and use as a cup/bowl
If really desperate you can put some sugar in there leave on the ground and eat the insects lightly fried the next morning.
Use it to reflect light, just put some silver foil around it and you have a Mirror!
To use as a place to Urinate/Defecate if stuck indoors like a tent, cave due to danger or bad weather, seal it, no smell and then after being properly
sanitised, by using it to scoop up water and boil it can be used to preserve food again.
Much Much more practical in real emergencies than Canners.
Also with can's you cant see the food before you open the container, if the can has been bumped or not airtight you wouldn’t know till it was too
late, and there is real risk of poisoning in this situation without knowing.
Strangely enough good Pickle jars are stronger than the thin Tin cans, however for extra life and protection some bubble wrap fixed to the outside
with duck tape makes it even more durable still transparent and easier on your body through rucksacks etc as you carry it.
Have a range of very strong spices like curry, chilli etc and any meat you can’t preserve with pickling singly add the spices liberally to give a
shelf life of over a year in that case.
Also depending on where in the world you are, using the glass jar laid in the very hot sun over a dark rock, or cloth background can really heat up
the preserved food before you waste any valuable firewood or cooking material.
Just use the fire to finish off the food. this also reduces the amount of smell and smoke which is important if you have had to "Go to ground"
Cans can rust, a good jar can be buried under the ground and if deep enough with the coolness there be safe to collect squirrel like at a much later
Drying is another very good way to reduce weight and preserve food, especially fruits.
They are what I would use, and have done much in the past, there is one added bonus to the glass jar method, and with the correct top you can also use
some of the fruit or saps from local trees and berries to make basic Wine and mead!!! for those long nights on the run from GWB and his Cowboys :-)
Anyone who says canning is purely talking about a static location where you don’t have to move and still have a safe secure workshop.
NEVER EVER SALT FOOD unless you know what you are doing, and how to treat the food afterwards, otherwise you will go mad like the seaman of Old days
and go delirious with OD of potassium and Sodium. ONLY ever salt after practising many times first with quantities and how much you can eat.
Also its likely to make you very very thirsty, water NOT FOOD will be your main concern, which again can be safely stored in a glass vacuum jar, and
will be much to valuable to waste on rebalancing your bodily fluids after an salt binge/exposure. You need salt, take as much as you can, add 10-20
grains into ever litre of water you drink if exercising much, and moving.
Most people would have massive salt carvings due the huge amounts in modern diets, however for the reasons above use it sparingly, its valuable, can
save your life or kill you!
Now a glass jar 1/4 filled with clean water if left in the sun for long enough will leave you with the minerals and salts from the liquid, when the
water has evaporated, especially if by the sea.
You can get a stocking or gauze and filter very muddy dirty or insect larvae water before boiling or distilling it properly.
Again how can you Can Salt? bit silly, so to keep it fresh and dry, and sugar too, and keep your matches etc in a Glass Jar is the only answer.
Nearly as wonderful as Swiss army knife, flint and tent in such situations.
The ultimate multi purpose survival piece of kit.
And hey who is going to barter or trade an old used opened empty can in such a situation, whereas decent Vacuum Jar with metal clasp lids, the ones
that not screw on but you pull the arms down with a rubber seal on the bottom of the lid might in such a situation be worth more than there weight in
gold, and tradable as definitely more valuable than the food they hold.
What’s a can worth when it’s opened? just a cut finger probably! and what would you do if you broke/lost an opener use your teeth to chew in?
Smoking food helps too, and should be done with any spare food you have left after a "Kill" or "fish" as a par for course with your fire at night,
smoke any leftovers, spice them and use them with dried foods to eat as you move during the day. eating little and often.
Hope this helps
All this from a glass jar some bits and bobs and a proper rubberised and pressurised top!
If though you find yourself still with all this advise, and excuse the pun, in a pickle, you can take one of your glass jars, that has been keeping
your paper and pensils dry and neat, fill out a Note and get your message in Bottle out to the world!