@Laura I’d do that now with my 2.5 year old, but I think with a 10 month old I’d through the baby on the front and the backpack on the back.
I used a carrier and zipped my coat over him. If you only have the backpack, drape a blanket or poncho over the pack and your shoulders.
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I carried my little on my back and a backpack filled with supplies on my front...plus my dog on a lead. Best way to enjoy hiking and nature. đź’š