So I'm 5 years too late for my son, but my cousin (and his wife) are about to have their first baby. I think he would be interested in doing some shorter day hikes after the baby is born but he will obviously need a baby backpack. I was wondering if anyone has any experience with these packs and if you recommend any specific models. I can tell you he wont want to spend more than $100 - $150 total. Please help!