I have the short Pig tripod. I started out with a Pig saddle on top of it. It's small enough to keep on the pack, and has been useful for seated and kneeling shots in the field, as well as clamping in my Leica rangefiner binocs. Minimal weight, minimal investment, and comes with the understanding that I don't have ballin' out of control rock steady standing shot capability.
I recently replaced the Pig saddle with a very lightweight Able Table. Part of my mandatory kit is a mini fortune cookie. it gets used a lot for truck doors, blind windows, rear bag, etc. I have been experimenting with throwing the bag on top of the table and shooting like that. From dry fire, it almost appears to be more stable than a cheap clamp (pig saddle), weigh less, and is definitely faster to get into position and move around.