Swift: (used as a carry on for a flight)
13 inch Macbook in a felted case (It was a bit taller than the bag, but I was still able to fasten it.
Power cord for computer in a medium pouch
Two "sock knitting" bags (one with socks in progress, one with three 50g skeins in it)
mini pouch with stitch markers, measuring tape, nail clippers and chibi needles
0.6L Sigg bottle
Movie box of candy
baggies of assorted food
full set of harmony inter-changeable needle tips with a few cables
Clipped to O-ring:
Burt's Bees lip balm
It carried very easily on my shoulder with my Aeronaut slung across my body. When I pulled out the backpack straps (which made the Aeronaut so much easier to carry) I had to hold onto the Swift to keep it on my shoulder.