I've grown squash in 10 gal containers or larger with allot of success....just letting them sprawl or training them on a trellis. Depends upon what you want the squash to look like.
I've grown bush cukes in 5 gal containers or larger with allot of success. I've even grown them in about half that size. But I found that they dried out too much if they were regular sized cukes, even if they were a compact bush habit.
On the whole, I'd say 5 gal is a preferable minimum, and you can go larger if you've got the space and the containers. Smaller and you'll be watering and fertilising more.
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