From Mono:

"Less is more. Unless you're talking about gear. We all try to pare down our rig as much as possible for touring, but sometimes you just need... more. More cables. Effects. A hard drive. Maybe even a spare t-shirt or two. That’s why we’ve created Classic Tick Accessory Case 2.0 - to accommodate those extras. The beauty of it? Aside from the fact you won’t be overstuffing your guitar cases, you won’t have to bring extra carry-on. The Tick is designed to become one with your MONO case, counting as one piece of luggage too. Easy."