"When a plane gets up to 35,000 feet, the pilots will adjust the cabin pressure to the equivalent of 6,000 to 8,000 feet in the air. The change in pressure is the reason why your ears feel so weird up at altitude, but it can also be why your sealed jars crack and leak. Unlike air, liquid can't expand. So when cabin pressure changes, the air inside the jar also balloons up and pushes outward. If the container is too weak, it's going to pop."
"Problem is, even if you checked in the jar, it will still go through the same thing in the cargo hold, which is pressurized to the same level as the passenger cabin above (this is why you should never pack carbonated drinks in your checked luggage). So unless you want your clothes to be peanut butter-scented, you'll have to be very smart about how you pack your sealed jars."
Carry-on liquids are limited to 3.4 ounces (100 milliliters), and sealed jars often exceed that limit or attract scrutiny during scanning. Cabin pressure is set to an equivalent of 6,000–8,000 feet while cruising, causing trapped air in jars to expand and push outward. Liquids cannot expand, so expanding air can crack, leak, or pop weak containers, creating messy spills. The cargo hold is pressurized similarly, so checked jars face the same risk. Packing strategies include emptying contents into resealable plastic bags, squeezing out air, and sealing to prevent expansion-related leakage.
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