What to pack??

I have one rolling carry-on and a medium-large back-pack for a 10 day trip.  Why would I not check-in luggage??
Bags get lost.

 Many people asked me to carry things to the ship. I packed 80 ipod earbuds, 100 RAM memory sticks, a 3 ring binder and other small things into a DCL duffel. I get to my carousel and the duffel does not.  Trying to communicate to the local lost luggage specialist and provide all my info was a 45 min challenge. 

Three days and still no bag. It had a luggage tag, delta tag and an itinerary and my business card.



Please excuse brevity and typos as this message was composed on my mobile device.