This is not your regular backpack that's made of polyester or rubber. It's made of neoprene, the same material that's used in making scuba diving wetsuits.
Neoprene is tougher and more durable than regular rubber. It's heat and chemical resistant. It's also water-proof and it can withstand all kinds of weather conditions like sunlight, oxidation, sand, snow, and dust. This means the bag will be able to last longer than other regular backpacks.
Neoprene provides strong cushioning to your kid's back and it protects the items in the backpack well.
Neoprene is completely latex-free, which means there's no chance for it to cause any allergic reactions to your child's skin.
It might cost more than other regular bags, but the additional investment is worth it. Your kid will thank you for purchasing a durable, comfortable, and safe backpack that also looks cute!