We have transport carriers/temp caging things that we get from either Dollar General or WalMart. Works really well for a cage cleaning or a trip to the vet. This is the smaller sized one (we melted in the holes of course).
Generally when we are cleaning either someone holds the snake or it gets popped in a carrier. We try to get all the snakes out regularily for handling and they slither around on the couch and the livingroom floor under close supervision as they love a fast, sneaky dash under a couch cushion or playing "hey what's behind the entertainment unit????" LOL
We have in the summer taken a snake outside in the grass as long as both Mike and I are there but it's always a bit worrisome though they never seem to really move all that fast. Kyna unfortunately keeps thinking she's a tree snake and attempting to climb the big birch trees. She also thinks she's a water snake and attempts to head for our creek. LOL We also have a fully enclosed screened-in porch so in the summer that's a nice place to take the snakes for a bit of a slither.