Just got back from 9 days at WDW and loved the Baggallini. DS is 16 mos and it fit 5 diapers, a travel case of wipes, snacks, ponchos, camcorder very nicely.
I found the strap very comfortable. I was worried after reading some of these posts. My only beef was that the straps, even at their smallest, were still a little big. I would've liked it to fit tighter across my back. And I'm not a small girl; flatchested maybe, but not small.
I only saw one other in the park: a periwinkle one. I saw lots of messenger bags that people got at AK. THOSE looked cool!!!
When DH and I go in Dec, just the two of us, I won't need it. But I was impressed with how much it held!