Very nice! I like the idea of the water being able to drain away from the box, i think I'd have a small plastic tub to collect that run-off water (waste not, want not). I've got plenty of reclaimed timber so i might have a go at making this :-)
Nothing special. I just used a large plastic garage bag that I had. It was a bit thicker than the average garbage bag however. This is the exact item amzn.to/35Noxkv