Bought a baby carrier in France, when we were travelling Europe. Its called Je Porte Mon Bebe - Physio Carrier. It is phenomenal, way better then any of the North American carriers, and we tried everyone we could get our hands on. I just bought one from a US distributor for my brother.
The 1st kid lived in that thing for months while we rode all over Europe.
I still toss him in it now that's he's 2 year old, for emergencies. But the second one usually rides in it.
Generally for the toddler, it's an Osprey that I've mounted to a Kifaru frame. I have always liked Osprey packs, but the hip belt on their kid pack is probably the worst hip belt I've ever had in the last 40 years of packs. But he loves it, so we use it.