Packing for a trip (of any duration) can be tricky, but I've found that the shorter trips (1-3 nights away) require particular attention. For those who pack suits or jackets and pants, the method by which you pack begins with your luggage. If you carry a garment-fold-style device, you will pack your clothing exactly as they hang in your closet, hangers and all. If you choose a suitcase or an overnight bag, you can still pack a decent amount that will emerge ready to wear.
Up until about two years ago, I laundered and pressed my own shirts. Now, I take them to the dry cleaner for the same. The amount of space required to hang up a number of shirts is deceptively consuming, and the frequency of traveling brought me to a final logical conclusion. Now, for about a nickle more, I have the dry-cleaners fold each shirt, and they are ready to either be worn, or dropped into a bag for a trip. For folded shirts, shelves or drawers are the holding method, and not a hanging bar. They require a fraction of the space that hanging does, and despite what some say, they ARE ready to be worn out of the bag. They are carefully folded around a rectangle of cardboard, and often in plastic. *** For the record, I save the cardboard and the plastic, and hand them in with the next delivery of shirts, to be used again.*** When it's time to pack, you can throw pre-folded shirts into a bag like soup cans into a grocery basket.
There is no magic to the method. If you prefer to try it yourself, invest $1.50 - $2 at the local cleaner, and ask for the shirts folded, and dissect and reverse-engineer the exact technique. Fold them around a similar sized piece of cardboard, and remember that the cardboard can easily be slipped out of the folded assembly... it is not required to accompany the shirt.
Also note that many dry-cleaners fold and box shirts as well. While this may be a good idea for formal shirts that see only occasional use, a simple cover or paper band will do... don't get too fancy.
*First class cabin. Thanks to theambershow for capturing this.