I usually pack for encampment and camping with a parachute bag.
One like the above which is smaller (think large sports bag) then one like the below which is equivalent to the
BMT-style issue duffel you see everywhere and has a shiny texture and
might be a little watery-resistant-kinda (probably not).
Toss it all in and mix about - it seems like no matter how much you put in them you can always cram
a little more, and you can park a truck on them rigged-wise (your bottle of Hai Karate will be broken, but
the bag won't rip or come open).
The advantage to these is you don't get stuff trapped on the "bottom" like a duffel, downside is you can't wear them
like a backpack.