Quote Originally Posted by HolySmokeMaker
The purpose of the ice is to keep the water cold cold cold. By keeping the water cold, you keep the tric's on the leaves hard (instead of sticky) so that you can beat them off of the leaves and capture them in the screen.

Pretty simple method with excellent results.
Thats pretty much what I thought. Have you ever used bubble bags?
I'm wanting to get a set, I just want to hear someone who's used them tell me how they work.