Let's start with what a Little needs to carry on a daily outing, family trip or to school/daycare:
Water/drink, Snacks (at least 2!), Extra change of clothes, Diapers and wipes, Activity books & Art supplies to keep busy, Favorite small games or puzzles, Snuggle buddy (in addition to his backpack!)
All of these things together weigh about 3 pounds, so it will NOT weigh your Little down. All together, your Little will be carrying less than 4 pounds! He may not notice that's he's carrying all his own stuff! (Note: the stuff shown here only weighs about 2 pounds!)
HOWEVER.... Animal Packers backpacks are designed to carry up to 5 pounds. Our lightweight backpacks just can't handle 3 full water bottles, 2 bags of crackers, 4 snack bars, a change of clothing, Mommy's wallet, car keys and lipstick.
Although these things will fit inside, the neoprene fabric can't handle the stress. It's like the time I put my husband's fitness weights in a plastic laundry basket to move them. I'm a feisty little beast, so when I (attempted to) pick up the basket, you can imagine what happened to the plastic!