We're not sure NASA uses the Space Bag on trips to the International Space Station. Maybe this technology was a big deal for the Moon landing. We really don't know.
We do know that these bags make a big difference to chronic overpackers. They squish all of the extra air out, allowing more socks and underwear to fit in that tight bag.
This one day (3/13) deal gets you 4 large Space Bags bags for $10. Many orders qualify for free shipping.
If you need extra space, these bags are for you!