I think single serving packets have a place in a backpackers diet. I use single serving packets of Artisana nut butters and coconut oil. They sell Walnut, Pecan, Almond, Macadamia, and Cashew nut butters that I know of, and a wonderful blend called Cacao Bliss that Doug Ide turned me on to. It is a wonnnnnderful mix of coconut butter and chocolate that is, as The Colonel says, "finger lickin' good". I
also carry Justins Dark Chocolate Almond and Peanut Butter bars. All are calorie dense, and the Justins bars contain anywhere from 25-29 grams of carbs in a 2 oz bars, along with 2-3 grams of fiber, 5 grams of protein and 14-16 grams of fat.
The nut butters are up close to 200 calories in a 30-32 gram packet, with good amounts of protein and fiber, but not much in the way of carbs. Other than these items, I prefer to buy in bulk and repackage in zip locks. Cheaper, healthier, and more options for variety. Oh, and individual packets of Via coffee substitute. Sorry, Roger. ;0)