Transporting a large lizard

How would I go about moving a large lizard like an iguana from house to house? Like what should I put him in?

I used a dog kennel for transport

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These guys can get up to six feet long right? I'd try a Sterilite Model 1764 110 quart latch box unless it's a really massive adult. If that's the case VE-175 Christmas Tree tub.