I do love them! Mine has 4 windows and is actually a small plastic trash bin with a lid that has 2 clips. I paid like $10.00 for the bin.don't you just love the buckets? I saw a youtube video from some guy in Australia that used them ("self-sufficient me" was his name) and they have worked perfectly for me. Free too! I've got 3 and when one gets grungy I just clean it up and dry it really good and rotate it in when I need to.
I was originally going to use a 5 gal bucket but I was worried about the lid being next to impossible to take off and put back on without cracking in the dead of our -40C winters.