While you may be reconsidering that, my ACR 2881 PLB and nylon canister & brass bolt clamp weigh 17¼ ounces, hang on a D-ring out of my way. I suspect that it's the cost that discourages most, as the PLBs have gone up to around $290, the canister around $110, plus the bolt clamp I had to add. Good for 5 or 6 years tho with a little silicone grease and a couple of o-ring replacements. Then $100+ for battery service. I carry it everywhere, in car, tractor, hiking pack, dive canister. Renewing the registration every other year is so easy; NOAA emails me, I click a link, then click that everything's still the same, and they send me a new sticker.
Now if I ever have to use it, I'll send it in with a good story, and they'll send me a new one for free. Here's one of their rescue stories I picked at random:
Paraglider Crash Gets Rescued in 45 Minutes thanks to ResQLink