These are a tad heavy, but they make up for the extra ounces….
1) They have labels.
2) You can squeeze every last drop out.
3) That lanyard with the clips lets you attach the bottles to the shower. (You will be surprised at how few showers have a place to hold your soap!
Believe it or not, you may not be supplied with Shampoo or Conditioner at AirBnBs or even hotels. Or if they do have Shampoo, Conditioner or Body wash it is cheap or smells awful!
That is why we carry our own, and when we are staying in a place for a while, I buy a big bottle of nice stuff and refill my small bottles before we leave.