Your work laptop backpack not only has your laptop gear but also:
1) Plantronics folding headset
2) AKG K317 earbuds
3) V-Moda M80s + case
4) Amperiors - well I might not feel like listening to the M80s today!
That Plantronics headset used to be a Beyer MMX2 headset but they were too big for other cans :)
I've also had some other combos with my full size sets like M80 + AKG K551 or Amperior + DT770s. Luckily my backpack is very spacious!