I have been using/recycling Fresh Step/Scoop Away cat litter
buckets too. I like the rectangular shape - more compact
storage in the winter inside the garage. Also the basic white
color (less the labels) - reflects heat. The wife hates them
though. Another small hiccup, is the two stick-up indentations
that makes drilling drainage holes on the bottom-vertical
sides rather tricky (for easy digging out, no bottom-horizontal
holes are desired - else tough to sever them roots in the
fall). The size is a little less than my preferred 5 gallon
buckets, e.g., plaster-joint-compound ones. Both seem to
be UV resistant for a while (I had bad others that crumbled within 2 years).