Many of us travel for business and, if you're anything like me, forget things on occasion, either forgetting to take it with you or forgetting to bring it back. EDIT: Of course, not all of us travel for business, or we take personal trips too. Consider this the "what have you forgotten when traveling" thread, not just for business. </edit> For instance, I've bought a few belts and a couple of neckties on business trips. A co-worker once forgot socks and, there being no socks at the local drug store, made do with double-layered ladies' knee high stockings. I've also forgotten my hair gel, but found that generous portions of conditioner work pretty well in a pinch. I'm also thankful for hotels which stock toothbrushes and toothpaste and razors. And although not a business trip, I did travel to a friend's wedding once without my dress shoes. A quick side trip and $20 spent at a payless shoe source fixed that! What have you forgotten?