I've had success with just putting cuttings in plastic cups with a bit of water so that they wouldn't dehydrate. In fact, in some cases I've just left them in the cup until they've developed roots and I felt confident putting them in the viv.
If they are in a plastic bag, just put in a moist piece of paper towel in with them and put them near your viv. They will keep a long time that way. Some people even use the plastic bag method to start their cuttings instead of planting them immediately.
You can also put them in deli cups (fruit fly/frog cups) with moist sphagnum on the bottom. You don't need to put holes in the top, but a few pin holes won't hurt. The height of the cup should match the height of the cutting.
Use a translucent tupperware, I use the 12x20x12 approximate sized ones. Put a layer of sphagnum, moisten, put a light over or place in a location that receives light from vivs, window, etc. I have had great success. I also use my froglet 10 gallons as grow out vivs....