Kids Small Backpack for Toddler Girls and Boys Baby Child Mini School Bags Nursery Preschool Backpacks with Chest Strap

Q: Can you fit a sippy or straw cup in the side pockets?

It's pretty tight, it's an adorable little backpack. It's firs about 2 bottles, couple diapers, small wipe case and a extra set of clothes, and that's all for about a 4 month old inside, the extra little pocket on front is a plus. The side pockets, not so much, I can slip my phone inside and that's snug. Hope this helps!