Recognizing my contributions to the other thread on this mentioned above, I'll say that I've used an ACR ResQ Link for diving (and hiking) based on my wife's concerns for becoming "lost at sea" while diving in Bonaire. I had DUI make me a canister using one of their heated suit battery canisters with a blank top and it's served me well on my trips. It is a bit bulky (the canister), but it holds a mylar blanket, a couple of granola bars, and the PLB, along with my credit card and car keys for when we dive Bonaire. It just attaches to my tank band and a safety band to my tank valve. YMMV.