Thanks for the great explanation, LiveOak. I've been been debating a Skytrain, I have an Airboss that I almost never use since I now use either hybrid bags or backpacks. I have an Osprey Porter 40 that's 38L (it's the small) so it would be the same capacity as the Skytrain (as would my EC Weekend adventurer, EC Flyte Weekend bag, Tough Travel Trizip, etc, etc.).

As for the Goruck GR3, I do love their bags (have a Rucker), and this one really intrigues me. I have a TB A45 and a MEI Voyageur that covers this size, but this one just might be perfect since it's the same capacity AND has the laptop compartment.I'll have to decide quickly since it ends tomorrow. Maybe time to get rid of a few to make room. I definitely have a bag problem