I've got the Masai PM, and I'm wondering whether I should have got the GM... It's not small mind you, my stuff fits just right, but I always like a bit of extra room in my bags! The shorter strap fits just under the armpit, while the longer one, as Crochet says, is long enough to sling messenger style, but only just (and I have NO bust problems!) I think it's a gorgeous bag, but now that I've used it, I would probably get a different sholder bag, because I don't find it very easy to get into if you wear it with the short strap, and with the long one, I don't like the length of it... So, a bit of a dissapointment, for me....