Go thick or stay home, bro. For airline travel, you want at least 10mm of closed-cell foam padding. This stuff absorbs impacts instead of transferring them to your glass. Top bags have 15mm or more. Don’t just rely on the bag, either—toss in some bubble wrap or clothes around the nose, tail, and rails for extra insurance. A thin sock bag is a recipe for disaster; proper padding is the difference between scoring perfect barrels and dealing with a repair shop.