I'm going on a month long trip to southern Africa next year, partly on safari and partly on my own. I've already purchased an Aeronaut 45 for my main bag, and am trying to figure out what to get for my under the plane seat/day bag. The CP was my top choice until I realized that the safari company requires one bag only. So whatever I get for under the seat will also have to fit in my Aerostar as well. It will also have to double as a purse/daypack for a number of days before the safari starts. I'm not really fond of the Cafe bags. I was thinking of getting either the PCSB or the PCBP. I don't plan to carry much on the plane, but when I'm gadding around town, I will be carrying a 35mm camera (no extra lenses) and a few items such as a light jacket, and a small travel book--possibly an umbrella. Maybe even a small water bottle. I like the idea of the packing cubes as they can do double duties for any souvenirs I pick up. I've never packed this light before and don't think that I'm going to have a huge amount of extra space in the Aeronaut, though I may be wrong. Thoughts? Other suggestions?