I am petite (5'1") so at first I was a bit skeptical about purchasing this. I'm glad I did! It's not huge and bulky, it fits me nicely and I don't feel like I have a tortoise shell on my back. It's very roomy and I can fit plenty of stuff in it. I love the organizer pockets that it has! I haven't tested out the insulated pocket yet. This is also a great backpack for hiking and biking, it's not too large and is comfortable