It seems like the issues with each pack are universal. My mom and I both got medium Mickey and Minnie, and in both packs the navy blue one is the largest, and the red Minnie ones have such ridiculously small ear loops that they can't be stretched over the ears without immediately popping off. The other two are moderate. Still too small, but not overly so.
I had read about the small size masks being so small that they don't even fit a toddler but holy cow, I was NOT prepared for how small they actually are! They are practically microscopic, LOL. They fit my teddy bears....can't believe that they made thousands of these things without batting an eye at how nonsensically small they are.