I have had a few of the vacuum bags thru the yrs. I am a big advocate of same, however one’s previous used have been thin, loose the vacuum and become brittle with time.
I purchased these about a month ago while preparing for a 10 day trip. Didn’t want to have a checked bag for my wife and I, that being said we started selecting the clothes while waiting for the bag. After selecting the attire and arrival of the bag’s (2) I decided to do a trial run. I placed the bags in the carry on then packed (men’s) 4 Slack/jeans, 6 shirts, underwear, & socks. For my wife I stored 6 slacks, 8 blouses, underwear & socks. I vacuumed each and was surprised to fit both bags plus shoes, belts, toiletries, electronics chargers, and was able to close the carry on with no issues. I have had it vacuumed since then (~3 weeks) and they have held the vacuum, all prior one lasted usually fully vacuumed for a week.
If you travel you need one of these.