QotD: I Should Make A List

What do you always forget to pack? 
Submitted by quornflour.

Cufflinks. I habitually wear double-cuffed shirts for work functions (and anything smart, really) but I have a terrible habit of fogetting cufflinks.

More than once my first port of call when away is a shop selling the things. As a result, I now have an excitingly large collection of them.