I am looking for suggestions on a summer top quilt.

The REI travel sack caught my eye... anybody use one? Would you recommend it?

I'm in Tx, and much of my hanging is in muggy East Texas, so I've been thinking about the synthetic option. I do like to have something covering me, even in the warmest weather. I'm not much into DIY at the moment, so looking for a ready made option.

ETA: I've also been looking at the Sea to Summit bag liners; any thoughts on those?