Isn’t it cool? It is not such effective as compression sacs, but it would be very useful  if you are on long term (Round The World) backpacking trip and need clothes for all kind of weather. This sacs won’t help much to compress t-shirt, but sweaters  or jackets  will take less space within it.  You can buy such sacs at amazon.com. It cost only 10-15$US depending on size. But be careful to check size first before buying any of these bags as larger ones may not fit inside your backpack, so should choose it depending on size of backpack.

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