I recently posted on a thread about storage boxes that fit into the basket on the Ollie tongue. One photo showed a grey water waste tote that I sometimes carry on top of the storage tote. I got a PM from @stlipa asking what kind of tote I bought, and why I chose that one. I decided to post my answer here on the forum.
I started researching totes and discovered that they come in various sizes, 6 gallon, 10 gallon, 11 gallon, 12 gallon, 15 gallon, 18 gallon. I just looked on Amazon and I even find 25 gallon and 38 gallon models. One gallon of water weighs 8.34 lbs, so you can do the math.