CHeck out a food a discussion over
here You can increase the no. of person/food/days that fit in a bear canister in a number of ways:
1. Increase fat. It carries 225% of the energy of carbs by weight, even more by volume. As Colin Fletcher advises, backcountry Zone calls for 30 percent calories in fat. While this is easy to do at home (too easy), most prepared and popular backcountry fare is light on the fat, heavy on fiber, and not energy dense enough, maybe 3.8-4 calories per gram. With the right amount of fat I increase that to almost 6 c/g over all. Olive oil, coconut oil, powdered butter, powdered WHOLE milk, powdered eggs, powdered cheese, pemmican.
2. Repackage. I vacuum pack everything and then pin prick at the trail head. Minimizes volume of powders, optimizes everything else. Lots of other packaging tricks, such as mixing powders with chunks, like chili sauce w/ rice/beans.
See this. Dont leave air spaces in anything. No ramen, e.g.
3. Forget meat. I never miss it. Or if I do, makes the Portal Burger all the better. Probably the most useless thing I have ever packed was a freeze dried pork chop. Popcorn shrimp, salt cod, rice/corn/beans, eggs, cheese, milk, maybe diced chicken, jerky, definitely wild trout, all more than enough protein.
If you could get everything as compact as granulated sugar, you could carry 25 lbs in a BearKeg 914. At half of that, you can feast for 6 days, get by for 10.