I'm a bit of an OCD geek when it comes to storage and recently got into carcassonne, of course this meant buying all "reasonably" available expansions. I'm pretty happy with my Artbin Solutions box, the 4-48 (4 fixed compartments divisible into 48 small ones) it's the 5004AB model.
It holds all of the tiles from the Big Box 3 plus tower, catapult, wheel of fortune/fate, river 1 and 2, count, king, cult-seige-creativity, plague and tunnel. plus all the tokens, meeples etc. EXCEPT the catapult and tokens from the catapult since I'm not fond of them
It also won't hold the scoring tracks and rulebooks.
Since I ordered it I found out that the Super satchel slim boxes, specifically the 9101AB (also from artbin.com) are also well suited to carc tiles and are bigger, so that's a possible for those who have lots of homebrew tiles.
I have just ordered another artbin box, the Deluxe Super Satchel™, Divided Top/Divided Bottom 6982AB. I'm hoping that the top box is deep enough to use to hold tiles, the bottom will hold rules, scoring tracks, catapult, the tower and other misc bits. and that the mini boxes that attach to the side will hold the meeples.
I'll post some pics of all the Carc stuff in the box once the new one gets here.