"backpack" for my push golf cart??

[cape cod beachfront golfer]

I have a new golf bag this year by Tour Edge...

Looks great but has terrible pockets.

The pockets are short and shallow.

Now that my Fall golf season is starting I need to be able to shed sweatshirts, etc as the day warms up.

There is no way my current bag will work.

Has anyone ever seen (or designed their own?) 'backpack' that would fit on a 3 wheel bagboy cart?

Would need it to hold light wind pants, wind jacket, hefty sweatshirt ???

I was thinking of something that might hang under handle then attach to bag.

Kind of like a hammock... but enclosed.

Current plan might be to use a drawstring gear bag attached with long velcro straps...

Better ideas ??? thanks.

[gwlee7]

I would think practically any collapsable gym bag would work. You can easily slide the loops of one of those bags over the handle of a push cart.  I see guys do it all the time with those collapsable  coolers.