Barbour makes a larger field bag. Waxed cotton with a leather flap. It has a couple of large snap pockets on the front and a canvas strap. I use it at carrying my sporting clays gear and will hold four boxes of shells pretty easily along with hearing defenders, shooting glasses and any other small items you may choose to carry. Throw it on the cart and have what I need. I suppose you could easily carry it around as it was designed as a field bag.
Once broken in it is very nice and it's a Barbour so the quality is there as well.

Mike Proctor