Posted by: ppine on Dec-12-12 6:28 PM (EST)
The nature of your questions suggests you have never used one. Paddle moving water and you need throw bags in every boat. Practice using them. Then all of your questions will be answered.
I have used them many times. Be sure to learn to stuff a bag correctly so that the line pays out. Some people coil their throw lines and stuff them in the bag. A bad idea. Let us know how you do.