Quantum 2 in 1 Sunday Golf Bag Black. Quantum 2 in 1 Golf Bag was made based on the consideration of a convenient way to transport your clubs. The 5â?? diameter tube construction bag features a large U-shape opening that allows to fit up 7~9 clubs in it. This bag comes with inside detachable tube which can form your bag firm and stylish with it, and also can be convertible and collapsible without it. The Quantum 2 in 1 is lightweight and easy to carry, while still provides maximum protection for your clubs.