Ziploc bags but not for wet clothes, I pack anything that will leak into the zipper Ziplock bags. Too many times have I opened my suitcase to find stuff leaked. Yuck.
Shampoo, cream rinse, face wash, mascara remover, perfume, body/hand lotion, moisturize, etc. It all goes into Ziplock bags. I even bring extra just in case. Sometimes I put small items in the regular sandwich ziplocks and then put thmt into the large zippered ones. The zippered ones are much more reliable.
No more surprises for me.
Oh, yes...one more thing I bring. A portable travel clock with a large display so I can see the time at night when my contacts aren't in.