Sorry, just checked, mine is the John Thursday 60, very similar to the Thirsty AL.
The size should be similar to the L size one, as I said, it is a very snug fit, like a glove but at least it makes it pocketable for me. Enough to put extra SD card only. Also, do note that snug fit will protect the camera much better than loose fit.
Bought the Thirsty AL but the shape of the protuding lens makes it really bulky to hold in a hand. Dropped it several times, luckily no scratches. Btw, shld i place the lcd against the black spongy side or the other in the pouch?