So for some funny reason I can't multi-quote but....
I'm sure it is because their weight is sitting on the edge of the ergo cutting off circulation under their thighs. I went to the babywearer (thanks- I think I see some kinderpacks, but am not sure about that much $) but I don't know the lingo at all! I've had kids for 11 years and always used carriers of different kinds but never paid much attention to patterns and styles and whatnot. I've had slings, wraps (moby and maya? I think?! For carrying both twins when they were little) and the ergos, which I've really liked.
What does SSC stand for. Sling style carrier? but that doesn't really apply to a back carrier? Gosh I am clueless!
Laughing hyena- That is a good idea. I could either try to extend the ergo so it goes to their knee joint (which I'm not sure I could do) or rig up something to add foot support, like a stirrup for their feet.
I hate to spend money at this point on carriers. They are almost 4 and are my youngest and last children. We are exploring and camping for 8 weeks this summer and I'm sure they'll need to be carried more frequently than they do in our regular life. Even if just in the airports!
At least now I know there are packs for older kids out there. Thanks