I was going to put this in the current bulkloading thread, but thought it would fit better here. I saw some people were only using their cannisters 3 or 4 times and then tossing them. I usually blow out the light traps with a dustgun between uses and just keep on using them. I have some that I've used dozens of times without a scratched negative. What say ye? Also, is there a particular brand or type you like best?