I've had cheap luggage carts in the past.  They weighed a bit less than this one, but they did not hold up.  This is a rugged cart, and it has one important feature for storage or for carry on an airplane:  the wheels fold flat.  Seems like not a big deal, but my last cart did not have it, and it was destroyed by an airline.  The folding wheels also make it feasible to make them somewhat larger, as they are on this cart.

Light enough, plenty rugged, folding wheels, rolls easily.