A big bag of potato chips easily fits into a quart zip-lock if you smash them up first. Then you just eat them with a spoon or put them in your tortilla along with whatever else you are putting in there that day. If you are cooking, they also would be a good addition to hot meals.
I met a guy on the trail who’s favorite trail lunch was peanut butter, cheese, fresh onion, and crumbled up potato chips all rolled up into a tortilla.
Potato chips offer about 150 calories per ounce; One of the best calorie to weight ratios you can get.