If you made a bin, you know the pitfalls. All that drilling was weird. It probably still does not breath right. It might be an inconvenient size. Or it did well and you want more. This is just the 18 gallon Old Toms Wormery bin and accessories. The bin has a large vent and two venting drains. The openings are screened for security. The bin comes with the worm filter and bed cover accessories. These make it easy to start your new bin. Buy this and the Old Toms bedding for a quick start.