Are you on the MASC forum? What's your username over there? I have the same name. You should bring a big Tupperware instead of trusting the bag, even though I didn't know Mantis could get through a plastic bag. I have a nice little KentMarine Salt 1-gallon bucket with lid, that I use to transport new critters. Put the bag in there. Plus helps insulate better too. If you make lots of long trips, you might also invest in a battery-powered airpump (cheap) and airstone. Helps keep it oxygenated.