First of all, I too wanted to add that raising roaches is so much easier and more enjoyable than crickets, and once you get your colonies established, you won't believe the money that you save. I would like to kinda clarify something that was said before, and I don't mean to offend anyone, but by USDA definition, most, if not all, the roaches mentioned here, as well as many others, are considered pest species. I only know this because I had a fellow roach breeder/seller tell me that it was illegal for me to sell my roaches without proper paperwork, and so I looked into, and sure enough, according to them you are required to file a fair amount of paperwork before you can sell and certainly before you can ship roach species. That being said, vaseline around the edges of the container and a tight top have worked fine for me, and I always make sure the animal (tarantula or reptile) has subdued the roach before walking away from the cage to prevent any escapes.