Of course this doesn’t include electronics, but for packing just the clothes, definitely useful, and not just for month-long trips. I’m going to try this when packing for my next one. Via Lifebuzz:

This video has no description, but the trick is rolling up your clothes. I think I remember my Uncle Chris doing this when he packed to go into the field when he was in the military. You’ll need to make sure there’s an iron available at your destination, and I’m not sure I’d recommend this for expensive suits. But for the casual, it would be fine. This will work for shirts, pants/skirts, socks, basically everything but any article of clothing that includes its own support mechanism. So basically, if you’re a guy, this is perfect. 🙂