You know..I have taken rodents on a plane as carry on in critter keepers, and those were put into a small camera bag...and kept safely under my seat... so I dont know why you could not put a snake in a snake bag and then put into one of those canvas camera type bags like I did. But do be aware, anything you take on as carry on, will be put through the x-ray machine. They saw my rats on the screen, and I did too as they went through, but they never said one word to me about it.