Making compost bins

I have been known to do mini compost bags by cutting out a square in the bottom of a blue bag from that Swedish furniture shop and stuff that full of compostable material. The bag lasts a couple of seasons and cheap as chips.

Pallets can be lined with them too, if you have a surplus, to make a compost bay last longer.

Or get hold of wooden posts, and if you saw out a space vertically on two sides of the posts, then slot in random bits of wood that are long enough to fit between the posts. Not sure if that makes any sense what so ever lol I'd say that's the best solution long term as posts last for a long time, and the wood slats can be changed out as they deteriorate.