My tray is filled with fruit, hand-gel, vitamins, clothes (each family has their own colors, and are either casual or formal), and occasionally a bottle of rain, salty candy, an energy drink, or a doc's consult. Once in a while I'll keep a weed-bomb, a story book/dvd, or a career manual. No matter what, I always keep one tray box open for items that are dropped on my doorstep.