Am I able to take 4 packs of bath soap in carry on luggage.
Yes, why wouldn’t you be? They are solids.
In principle: yes you can.
Some soaps contain glycerin, they did trigger a security alert. This was especially the case with homemade glycerin soap bars.
Modern equipment should make the difference between a soap bar and other material. Still, some years back there was a ban on soap bars in some airports of less developed countries.
<<"Yes, why wouldn’t you be? They are solids. ">>
True. Although there's always one... I travel with a block of hard shaving soap to save carrying too many liquids... On one occasion at Heathrow my bag was pulled and the agent convinced herself that it arguably had a "creamy consistency" and should be in my liquids bag - despite me rapping it against the table to demonstrate just how "creamy" it wasn't. After a supervisor ruling and a swab test I was allowed to keep it.
The other umpteen times it's not been questioned, I guess the vast majority of agents know the difference between something that's completely solid and something that's, well, a cream.
Had a similar experience at LCY when the security agent had issues with a solid deodorant stick. She said it looked like it could have been a liquid. I took the cap off and showed her it wasn't a cream jr a paste. There wasn't room in my liquids bag and I didn't have time to continue to argue, so abandoned it.
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I had to undergo extra screening at LHR last year because of a solid shampoo block in my carry-on bag. Advise you put the soap in your liquids bag to avoid such a delay, which was quite long. Must say LHR has been the only security screening that triggered that alert but now to be safe I put it in the liquids bag.