ONA bags are mighty fine, the wax canvas is a bit of a dust agent but the leather ones are looooooveeelllyyyyy. The Bowery is perfect for a one/two camera set up and spares, I'd often have a two camera 23/56 combo with an i40 in there plus batteries, cloth, business cards etc...
Today I took my X-PRO2 out with the 2/18 on it and the 1.4/35 in a Crumpler banana cube [small]. Room for the usual accessories too.