Jennifer Sparkes wrote:
The message
from "Furby" contains these words:

I have heard that you should always double up on grow bags. I.e.
one
on top of the other (so the roots have more room to grow)

Not very economical on bags but what my Mother always did was to
cut them in half and use each half as one would a flower pot.

Also is it me or have grow bags got thinner over the years , I
seem
to remember them being the same size a 75L bag of compost.

I thought that when I saw some yesterday ...

I thought they'd always been about 25 litres. I used to grow tomatoes
in halved 25-litre plastic drums, one bag between two halves, one
plant each: much better than the growbag itself. (I think something
comes, or came, in 30-litre lots, though -- I suppose that could have
been earlier growbags.)

Mike.