Ok. I will try to find out how to do that efficiently. For the record I did try to look up how to do it but all I kept coming up with were how to rid a house of rodents using rat traps and poison. Again, I guess I was not searching correctly (obviously) if this information is out there and I just didn't find it. The reason it didn't die in the bag is because I left too much air in there, so aside from it trying to get out, I wouldn't say that it was suffering much. I only waited about 2 minutes. And I couldn't believe how fast it died with I pressed down on it. I didn't press hard enough to crack bones or rupture organs. Only hard enough so that it could not breath. I have to admit that my heart skipped a beat while doing this. I've never intentionally killed an animal in my life, but I tried to think of it as food and went on with it.

Anyways, sorry if I disturbed anyone with my methods...