All the Pentax Q stuff is so tiny and light. In the Event Messenger 100 (a small, purse-sized bag) I'd carry the 01 standard, 03 fisheye, and 06 telephoto zoom lens, with the 02 standard zoom mounted on the camera. If the camera wasn't in the bag, it felt empty, the lenses are so light.
The Q7 and the four lens kit weighed barely an ounce over the one pound mark. I have full-frame autofocus zooms that weigh more than all of that combined.
The Nikon 1 J1 is small and light, but the bigger 1" sensor means it needs bigger lenses. It all still stows in the Lowepro bag with ease, but just ten ounces makes a noticeable difference in the weight of the bag.
.