Sus: One thing to note - when Caleb gets taller, will not be able to nap comfortably in it.
Right now, #3 at 72cm, her head pops just above the cloth, so her neck is support to some extend & she can still nap in it.
For #2 at 88cm, the cloth ends under her arm pits, which means the entire neck if above & as she was sleeping when we tried on the carrier, her entire head was slagging off - there is no support at all.
So, if you are out hiking all day, that may be a concern.
For the X carrier, I am able to adjust such that bb's head is supported by either of the top strap when she naps. Of course with the sarong, we can change bb to a sleeping position, just that weight distribution is not as ideal.
In any case, the lady said we should not be carrying babies when they get too heavy... hmmm...
Perhaps you might want to check if there is any local shop that you can avail yourself with a BOBA to try out before actually purchasing it.