I have carried on 2 bottles with no problem but can't say about the corkscrew as we always took champagne and did not need. As for putting it in your checked luggage, have you ever seen how they handle that luggage? I would never do that but I know some folks do. I just don't know how you can explain "accidently" slipping in 4 bottles in your luggage <VBG>. But if you do just be sure to wrap it up so if it breaks it does not ruin your clothing.