lisa- i usually push my son in a stroller on the way there & he runs back. i tried carrying my 4 month old in a snuggli a few times- like your backpack idea- only snugglis go on the front... it KILLED my back, tho. even with conciously making sure i was standing properly with good posture, etc.

i could get some leg weights, tho- huh? and maybe some wrist weights for when my hands are free on the walk home.

great ideas! thank you