There are a few things out there but non ideal. I ran across this one but I'm not sure if the pockets are big enough for a portable amp. Maybe if we request a special "Audiophile Edition" they will make one for us. Other than the pockets everything else looks really good. I specially like the option of both a handle and a shoulder strap and the fact that it stands up straight due to a solid base with metal feet.
It's called the DELOOP and it's on Kickstarter