dont cache food with much of anything else, because it draws animals. Likewise, don't cache weapons with much of anything else, nor metal items with much of anything else, because of metal detectors. The food caches will have to have "linings" in the hole, of "Sacrete" concrete, and about a 4 ft diameter Sacrete "lid" underneath the top covering of soil, sod, forest debris, etc. This will discourage animal digging, without having to use metal to keep out rodents. Best to have yet- another cache of food, tho, which IS in metal cans, with "ratwire' to keep out the rodents.
Best to just cache low-$, simple stuff like hard winter wheat, blackstrap molasses, salt, spices, stuff that "keeps" for YEARS without it going bad, that won't freeze, etc. Widely available plant foods, like pine tree inner bark, acorns, pine "nuts", may apples, and cattails will suffice to "stretch" the grain you've stored, ya know. burying stuff is a HUGE PITA, compounded by your need to keep it all a secret from anyone who might be in the area. That means burial at night, without having driven up to the cache area after darkness fell. Doing that would mean anyone there would know about you, and you wouldn't know about them. If you arrive in daylight, and make a "casual" circuit of the area, you are likelly to notice anyone who's around.
Pick a spot that's surrounded by vegetation, to hide you from prying eyes. Try not to use your red lensed light at all (with the # of tape on the lense) and if you do have to use it, keep it pointed down, and turn it off ASAP. After dawn, return for another casual circuit of the area, and look for any signs of digging that you missed in the darkness. If you are smart, dont bury more than about a 5 gallon bucket sized container at any one place, and a poncho will suffice to keep the dirt up where you can dispose-hide it later, if it wont all compact back into the hole.
It's a good idea to shallowly hide-bury an old shovel, entrencing tool, axe, et. not too far from each cache,, with an insulated wire attached to it, so that you can just pull it up, even if the ground is frozen. Accessing a buried container, with just your bare hands, could easily be a nightmare if the ground is frozen, ya know.
Every cache should have a set of ski gloves,longjohns, trotline setup, a balaclava and a couple of large "heavy duty" trash bags in it, along with a paraffin candle (3 wicks, make it yourself, non metallic container) and a couple of non-metallic ways of starting a fire, along with some means of purifying water, even if it's only something to boil water in(preferably non metallic) Matches, (sealed up, of course)and a magnifying glass, some Vasolined cotton-balls, will get you going. Some "potable aqua" tablets, AND a "water straw" would be a great idea, along with something in which to carry water (maybe an unlubed condom, and the crockery pot?) A means of carrying all that gear would be a nice idea. Maybe a bail or handle on the container itsself? Soap, and bug dope, bugnetting will of course be a blessing, the netting keeps flies from laying eggs in your flesh food as you dry it.
Best to bury the treble hooks, snare wire, knife, etc, away from the non-metallic stuff. You can put metallic gear in a metal container, and be fairly sure that earth pressure, freezing and thawing wont have harmed it for many years. Avoid deep burial, because that increases lots of your problems. That is, discrete burial, later access, and earth pressure tends to crush things like pvc pipe, much less plastic buckets.