We got the medium size for our kiddos who are toddlers 4yo and under. Based on the medium bag size, I’m sure the small would’ve been fine but we wanted them big enough to grow into. Pictured is navy blue, pink, and royal blue. Navy blue is not much darker than royal blue but my son was ok with it. 

My only real complaint is not having a way to hide the zipper. The kids can find it and unzip the bag exposing the delicate stuffing bag inside. Fingers crossed it doesn’t become a thing.