We are an ebags family too! DH is mildly obsessed with his Motherlode backpack. I got the carry on version, but it's smaller than my old one and does;t have spinners, so I am kind of wanting something new (I needed an International size carry on). Maybe I will check out the Away luggage people keep mentioning.
How do you like the backpacks - those are the professional slim, right? I have been eyeing that as well. Which size do you have and how does it fit under the seat? Can you get a water bottle in the side pocket?
Also, the motherlode backpack I see you have as a personal item - is that the full version or the weekender?
My kids have the larger Potter Barn Kids spinners for carryons (got stripes, not a cutesy print, so hopefully they won't outgrow them for a while). We usually fly SW and the PBK bags are fine for size, but I am concerned they will be too big on Hawaiian Air in Feb (spinner wheels take them over the size limit for carry on), so I may just have them bring their large LLBean backpacks. Kids are 9 and 6 and I worry the backpack will get heavy for the little one...