I got the same color as Pippa's but in the smaller sized Bristol bag. Given my petite frame (barely 5 feet!) I thought it was better suited for me.
They had more of the shark color in stock earlier today in the medium size though and I wouldn't be surprised if they had plans to carry more soon. If anyone here has their heart set on the medium in shark, I'd reach out to their customer service directly and let them know - they've been really great to deal with!