Planter Liners

Hello folks. Looking for a bit of help.

I've acquired a wooden planter and was wondering if black bin bags could be used as a liner? Just looking to keep costs down! Many thanks.

 

Yes- they would be fine, but it could be worth doubling them up as they aren't generally as sturdy as compost bags, or the rolls of plastic you can buy.
Pond liner is very good, and is often quite inexpensive. Lasts much longer