I generally use one of two things:

1) a simple light nylon sack, run up on bear hangs, or hung with pct method on a limb.

2) an ursack - tied with figure 8 knot to a tree.

I typically use 1) if I'm going somewhere with bear hangs or lockers, rather than take the weight of the ursack. If I'm random camping, or there is no bear facilities, I like the ursack because it's just easy and I'm lazy