I've been using the Agawa Canyon Boreal 21 for the past year or so, it is fairly compact when folded, it's sure nice having a full size 21" bow saw in the woods. It's super sturdy, and North American made, and came with a pretty sweet leather sheath. I've also got a couple of folding Silky's but as mentioned previously, carry a spare blade, fantastic cutters but easy to snap a blade.
I'm a fan of my Coghlan's folding saw for camping. Anything beyond light firewood, I love my Stihl MS360
I bought some pruning blades for my girlfriend's sawzall, she loves that thing. I haven't found a pruning saw yet that won't cut like crazy in green wood. My sak kinda sucks on anything bigger than a pencil though. I haven't used it since I got in trouble for cutting limbs out of a tree to make a push pole and spear to go frog gigging at my girlfriend's Christmas party.
Frog gigging at a Christmas party? Impressive. I got kicked out of a store once for catfisting in their fish tank.