These kits save more people from discomfort,injury and death from insect wounds annually than all the 'bearstoppers' ever will. There is a great deal of negative opinion on their efficacy with snakebites. Sawyer is actively seeking reports of use involving snake invenomation. My own DVMs assistant had the temerity to throw my unit in the trash. A well known DVM authority lectures that all suction efforts are ineffective. I used mine once on a horse with a lower leg bite to good effect( waiting for said DVM and assistant <img src="images/graemlins/grin.gif" alt="" />) The use of constricting vetwrap may be as much help as the suction effort. I know this: Rapid access to full medical support is still #1. A Sawyer unit may, or may not help. It does honor the first aid maxim of "Do no harm" and helps focus people who would otherwise panic. I retrieved mine out of the trash. <img src="images/graemlins/wink.gif" alt="" />