Non-perishable (or long-perishable) snacks

Mini Kind bars
Trader Joe's Marcone Almonds (slightly seasoned with salt and rosemary)
Nuts and dried fruit (TJ's sells a bag of snack-sized small bags of cashews, dried cranberries, and almonds)
Pretzels

Lara bars are good -- they're very few ingredients, basically just ground fruit and nuts.

Nuts? Trail mix? There are a bunch of individual pack-type things, couple ounces or whatever each, so they stay fresher.

Do they have an electric kettle or can they get hot water? There are a bunch of good ramen/noodle things come in bowls where you just add water, like Annie Chun's stuff. They're just upgraded ramen-type stuff, but it's better than ramen (still salty but not that bad in other ways). There's shelf-stable hummus and bean dip individual-serve things that they can have with pretzels or pita chips. Same with pb.

Also freeze-dried fruit and veg are really good for snacking. They're just light and crisp just the stuff.

For trail mix, it might be cheaper and generate less junk/wrapper waste to get a larger container and portion it out in smaller snack-sized containers. (Though technically one serving is about half of the smallest snack container I have found.)

Graham crackers spread with a little all-natural peanut butter or almond butter
Trader Joes has canned stuffed grape leaves that are pretty good

Nuts and trail mix? Jerky (though that's very salty if they have to watch sodium)? Dried fruit. Actually, some fresh fruits keep for a while too and can be shipped in baskets or boxes from places like Harry and David's. They're pricey, but Harry and David's, Hickory Farms etc. do have variety packs of fruits and snacks that do not need to be refrigerated.

Some hard cheeses do not need refrigeration and may actually be best if kept at room temp. Authentic Gouda is one, but research this carefully.

Brightdreamer said:

For trail mix, it might be cheaper and generate less junk/wrapper waste to get a larger container and portion it out in smaller snack-sized containers. (Though technically one serving is about half of the smallest snack container I have found.)

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I did this, bought raisins, chocolate chips, and cashews (unsalted).

I haven't bought any this go round but one of my favorite camping treats is the freeze-dried neapolitan ice cream they sell at REI. Apparently it was designed for astronauts.

I also bought some Mandarins, or maybe they are Clementines.

Store mandarin oranges in a cool, dark place (like the fridge). At room temperature they’ll last about 1 week. Refrigerated in a bag they should last 2 weeks to 1 month.

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I'm hoping for a month in the fridge. Instead of peeling them I just slice them in half (top down) and dig the sections out.

I also have pop tarts and 'fruit and grain bars'. The bars are the soft ones, easier to eat than granola bars.

There are snack subscription boxes.

Kind has one for kind bars

There are others.

I love the smoked trout in oil they sell in tins at trader joes. Keeps on the shelf, great on crackers.

Patty said:

I love the smoked trout in oil they sell in tins at trader joes. Keeps on the shelf, great on crackers.

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Ooh, me too. I always have at least four tins on hand. Also makes a good lunch with a salad.

I've seen snack-sized foil packets of olives...can't vouch for how good they are, though.

Nutella! It's shelf-stable, calorically dense, and good on crackers.

Be sure to pick up some tortillas, too, so you can make a little snack I invented* called "Nutelladillas."

Nutelladillas (Pronounced "New-tell-uh-dee-yuh) are basically quesadillas made with Nutella instead of cheese. Be sure to put a little butter in the pan when you cook it, too; it adds a much-needed dash of salty goodness.

*I'm sure I'm not the first person to come up with this, but since I've never heard of anyone else doing it (and the various guests I've cooked it for have also never heard of it), I'm claiming credit.

Honestly, those logs of sausage like Old Winsconsin or such, as well as those babybel cheeses, would work great. Snacks can be kind of wearying to eat for extended periods of time, and cheeses make you feel like you're eating real food.