I am considering a Speedy 30 in empreinte. I would have preferred the 25 but it is no longer available in the 25. Because I don't carry a lot of stuff in my bag, I am concerned about the domed shape of Speedy 30 looking sunken or caved in if I don't have enough items inside to "poof" it out. If you have a Speedy 30, please share your observations. Thank you!