I had an Outward Hound one. Definitely do not recommend! Not at all.
I have last year's model of the Ruffwear Approach Pack and really like it. It seems to fit Journey well, but I can't really comment on the packing part yet because she's too young to put a whole lot in it IMO. It kind of goes off centre a bit when she moves around a lot, but not anything major.
They definitely are pricey though. Worth it I think if you're going to use it a lot. I paid barely anything for mine, which is why I bought it... I probably wouldn't have if I'd had to pay full price, just because I know I likely won't use it a ton. But it'll be nice to have on those days I want it.