The case is just barely bigger than the Empeg itself, and is made of flexible nylon fabric. I imagine if you can fit the Empeg into your backpack naked, it would probably fit when inside the case. Depending on how you're stuffing it into the backpack, you might have to leave its second pocket empty, though. Refer to the pictures on the web site to see what I mean.

Tony Fabris
Empeg #144