What I did was roll them up with a scarf, like put one palette down at one end of the scarf, role once or twice, then another palette and so on... Or put one pallet at each end and roll to meet in the middle
Then just stick it in the middle of the suitcase cushioned between all your other clothes(: never had any break or anything in all my times flying(: I also always keep my eyeshadow palettes in my CarryOn bag and not in checked luggage to make sure I baby it! My palettes are like my babies, so I know how you feel! Lol
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