Tom Gardner wrote:
I've successfully grown potatoes in the big blue Ikea
"frakta" bags, 40p each.

Do they not waterlog?

Not noticably. They are made from woven strips of
plastic not solid plastic sheeting, so excess water
can drain between the strips.

*nod* That was what I was trying to remember. The builders' bags are
made of similar stuff (at least, the ones I have are)