Tanzania, Houston Has a Problem

OK, so I just weighed my backpack and my camera bag, both of which I will be carrying on my body quite a bit during the safari. 29 pounds. Perfect! Except that the backpack only has my sleeping bag, sleeping mat and collapsable chair in it. That's it. No clothes. No stash of granola bars and almonds. No mosquito net or cute floppy hat. No toiletries, no tripod, no Tevas. The guy at REI told me not to carry more than one fourth of my body weight on my back. (He added "one third if you're in really good shape." OK, so one fourth.) I need to gain 60 pounds this weekend.