I run 2 of the 60" Amish Outfitters Beefy Bags. They are outstanding and will replace them with the same IF I ever wear them out. I run on 1 bag, 1 engine most of the time. If it's choppy and wind is blowing and I need more thrust over the rudders to control heading, I run 2 bags, 2 engines. I can slow down from 4.9mph (600RPM both engines) to 1.1mph if needed with ease. 1.8MPH both engines is around 750RPM with both bags out.