I have both a Vera and Baggalinni...I've worn the baggalinni to Disney several times and there are two things I have decided I don't like about it.
1. It irritates the one shoulder it is hanging on, and because it is bigger I tend to carry more in it, thus it gets heavier. The straps are wide and not very soft.
2. It's hot, it doesn't breathe. Great for rain but not great when it's 95 degrees...I always ended up with a big sweaty spot from carrying it.
Why I like the Vera Hipster:
1. It's cotten, so it breathes. I never feel overly hot with it.
2. After using it for a few weeks the straps are nice and soft...plus I think they are narrower so they don't cut into my neck.
No matter what kind of bag I carry to the parks I always pack several ziplocs...big and small for those rain showers that can pop up. I wore my Vera under a poncho recently at a baseball game and it stayed nice and dry...we plan to cover up if it rains so it shouldn't get soaked.
Just my 2 cents, hope it helps somebody out.