backpackin' mama
Calla is such a pretty name. I can recommend the Deuter Kid Comfort II. I did a lot of research online and the Deuter and Kelty brands came out tops. They are both manufacturers of backpacks rather than toy companies that make carriers.
The Deuter appealed because it has a very easy height adjustment -- papa is 6'3 and I am 5'5! Grandpa, who is an avid mountaineer (and I do mean serious mountains) was very impressed with the pack. The Deuter has proved to be everything we had hoped -- we use it for lazy strolls and serious trail hikes. Baby loves to be able to see everything, and to be able to pull everybody's hair! Deuter has a good website - you can check out the diagram of the frame and the ventilation system - appealing given the heat and humidity. I know several other HK-based parents that have bought the pack after seeing ours.
Retailer in HK is ProTrek - there is one on Hennessy Road at the Admiralty end near the Kebab shop (look for the large Kebab sign!) . Call ahead - they sell very quickly.
Happy trails,