That's easy

Bubble bags are what I have. I got mine from Kabubaba.com but they are mostly the same. The 7 bag kit is better then the 3 bag kit.

http://www.kabulbaba.com/

Bubble man is the person who invented this method.
http://www.bubblebag.com

A lot of people are starting to use tumblers again too from here.
http://okief.com/

There are compaines that make shakers and other systems but the tumblers and bags are easy and not bad for the price.

This company also makes bubble bags but I have not done business with them.
They have been around a while and have good pricing.
http://www.resinextractor.com/product1.htm