I want a really cool bookbag?

OK so for about 2 years now I've had my turtle shell book-bag but it's old and it doesn't fit all my stuff anymore and next school year my books are going to be bigger... i still want a really unique and cool bag but i want 2 straps and something not too expensive i'm not willing to go over like 50$(i like turtle owls and colors ) please help me and send me links and pics thanks and i wish you all good heath and a happy summer!