The answer will depend a lot on the length and difficulty of the trail, and if you will be carrying the whole time or letting your 2-year-old walk as much as possible. If you are undertaking a family hike for anything over an hour, I'd highly suggest looking for a structured hiking backpack. Forward-facing soft-structured carriers really only work well with smaller infants. For a 2-year-old, you'll find a framed carrier helps to evenly distribute the weight.