Short verdict

Skip. Usually not worth luggage space, shipping cost, or the risk of buying before you know whether you need it.

Hair care is one of the easiest categories to overpack because large bottles feel like value in store.

What to know

Buy small treatment packs, travel sizes, or Korea-only sets if you have a specific reason.

What to avoid

Skip full-size shampoo and conditioner unless the product is hard to replace and you have luggage space.

Final verdict: small treatments can work; big bottles usually skip.