Another fan of the chutes. They're a bit thicker than the plastic chutes (such that you may need to modify your fold technique for smaller BTs), with thicker shroud lines such that you'll need a bigger snap-swivel (if you use them), but the rip-stop nylon is lighter than the nylon chutes that Estes also makes available.
I think it was the 18" chute that I used in a BT-55 at the last launch.