I've been looking all over but can't seem to find a bag that fits 15.6" - I'm only finding bags that fit up to 15.4" and am nervous that they won't fit..

Plz help!

There are plenty of bags out there made to fit laptops over 15.4".

You can look for one that's specifically for 15.6" laptops[1], or even for one that's for 16"[2] or 17"[3] laptops.You can check the tag use notice or measure its size with ruler.