Verified answer

If they are made of foam or silicone or other synthetic gels, they will not expand when cabin pressure changes and there is no danger of explosion. Anything that is completely filled with a solid, a gel, or a liquid will not expand because these substances are not compressible. Only things filled with gas expand.

Souvenirs that are inflated might leak or pop at very low cabin pressures, but in an airplane the lowest cabin pressure is roughly equivalent to that of Telluride, Colorado (8000 feet), and so most gadgets, drink containers, etc., can handle the pressure changes without any problem.

You will probably <<not>> get those things through the security check point in your carry on luggage - because they will probably contain more than 100 ml of liquid. If you try it, expect them to be confiscated.

You will have to put them into an item of checked luggage. Putting each of them into its own zip lock bag would be a good idea. However, the cargo hold <<is>> pressurized the same as the passenger cabin, so there is no difference where you put them in terms of exploding - - - which is very unlikely unless one of them has a weak seam.

Well, you will have to deal with going up to the counter and saying "what can you do with these squeezy breast things on the plane because they may explode under the cabins pressure"

Kevin, this question brought a smile to my face this morning. if they will feet in a large freezer bag, a zip lock style, then just as a prevention I would put them in those.

Really I can not see them exploding, atmospheric conditions on aircraft are regulated similar to ground level.

Haha, that's cute! Just to be safe I would wrap them in bubble wrap or something and put them in the luggage.

explosive boobs?

If they are party gags with even a little bit of gunpowder in them, they'll confiscate them anyway. put them in the suitcase.

Put them in your suitcase.

They won't explode. That is an urban legend. Also, you have cool friends.

You should hide them in your pants.