Yeah, I agree. I use the 18 hr supersize ones and use safety pins to put them on the chest of my base layer. Sit for 5 hrs. Zip them up in a freezer zip lock bag, squeeze the air out and I can get 2, sometimes three sits out of them. To make toe warmers out of them cut the tops off a pair of big socks, put the warmers on the toe of your boot and put the sock top over the toe of your boot to hold them in place.If it's bitter cold I use 3 of the hothands 12 hour super sized adhesive warmers. I put two, over my first layer, on my kidneys & one on my heart. Then layer over that. It keeps my hand & feet warmer than anything else I've tried. I can't stand the toe warmer packs or insoles. Always uncomfortable.
Add 2 extra large hand warmers on your jugular under a neck gaiter & one under a beanie & you'll be like sitting next to a fireplace no matter the conditions. Hands & toes will stay more than warm.
A case of each online is pretty cheap.
Although, one of the posters above has me looking at these. Good soles, 700 fill power goose down and the pair only weigh 1lb 6oz! Sounds pretty darn good.