A dog poo bag holder to stop them unravelling. This is designed for the ones you can buy in Pets at Home in the UK. It's meant to be as small as possible so it's no more hassle than carrying the roll on its own. It has a spindle in the middle to allow it to spin nicely inside and a screw-on top

I used tree supports for the main part (only on the elliptical hole). And normal grid supports on the top section