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There are various "openings" allowing for
easier re-packing of the bags.
I always attempt to dry out the line
before storing it away for a few days.
Throwbags take some practice to properly
judge distances, current, timing, etc.
of the L.L. Speedloader bags. It surely can be restuffed much more quickly.
We used his bag along with a bunch of others to practice rope throws at an annual whitewater class our small club had this spring. The L.L. bag seemed to me to deploy the same (no better and no worse) than the others.
When you have multiple paddlers queued up to run a rapid, being able to restuff the bag quickly after reeling in a swimmer so as to be ready for the next paddler's run can surely be convenient.
I would not suggest putting rocks or gravel in your throw bag. The last thing you want is for your bag to sink to the bottom.
Opinion is divided, but I usually don't put loops or knots in the end of the free line of a throw bag as shown in the NRS video. There will be times when you have to let go off your throw bag rope, to avoid clothes-lining a paddler coming downstream for example. Throwbags which are loose in the river usually move downstream bag first trailing the rope. A knot in the free end of the rope trailing upstream might well jam in a rock crevice and hang the bag up in a relatively inaccessible spot. This isn't just theoretical; I have seen it happen.
I was attempting a rescue on a friend's boat once with a line that was coiled and stuffed in the bag. I never want to repeat that experience. People have it right. Lay the line in there in lengths.