Just tossing in my thoughts - I say 16 or more. We have done several overnights and the comments we always seem to make to each other afterward are... 1) we need a huge net so we can just really pack it in the back 2) We need a bigger raft. It is usually the 2 of us and 2 sizable dogs. We took a third on an overnight float (3 adults, 2 dogs) and it was fine/tight, but it just would have been nice to have a little more room. Sleeping bags, tent, food (beer!), cooking utensils, clothes, firepan/firewood, groover, crap like that seem to add up. Some people are really minimal (not quite us) - but with kids I imagine that might be nearly impossible. Good Luck!