From the enlarged version of the picture, you can read the top of the instruction sheet, which has the "Adventure Medical Kits" and "Equipped to Survive" logos. It does seem to have a different whistle than my kits, looks like a whistle I have tied to some life jackets, made by a Marine safety gear company called Orion I think. With the ETS logo on there, I think it's probably legit.
_________________________
- Ron