Wearing two!

My husband was carrying our four your old when our toddler asked for a ride too.  I tied the toddler on front in another mei tai.  My husband said he could feel the weight but was not uncomfortable.  The toddler did sag after a while I think because it was hard to tie the mei tai tightly enough, maybe because I had to cross it quite high on my husband's back.  If both girls would like a ride at the same time in the future I think it would be better to tie my toddler on the front first and then the four year old could be tied on with rucksack straps.  My daughters only want to be carried when they want to now so it's hard to experiment - so if you have any experience with tandem wearing I'd love to hear from you.