Last time I hit the road I took some of those really cheap clear plastic storage bags you can suck the air out of with a vacuum cleaner. Of course once you get to your destination and unseal them there's a whole mighty mess, like the one you're trying to avoid. But then over time I worked out that 70% of the stuff I'd brought with me remained in a crumpled heap at the bottom of my bag as I ended up recirculating the same two pairs of shorts and t-shits most days! I think the rule of thumb when packing for the long haul is less is more (or so I've heard from people that don't travel the world with a full scuba and underwater filming rig)!