I use the Eagle Creek Pack-It system and love it. I have several of these regular bags and a few compression bags. All of them work surprisingly well, they allow you to fit more things in small suitcases and keep things organized. They add no weight and are well made. I've used other types that are more square and mesh, but have found the Pack-It system to be more versatile and useful (and cheaper). They have a special sale from time to time and I've bought several over the years when that happens so I have quite a collection but they are worth it.
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