I had a light plastic and rubber one that holds a mini bic. Makes the bic a bit bigger, so easier to hold with cold hands, but the reason I got it is because it will attach to a key ring. It's bulky and adds more weight, so it's now living in the bottom of my 20 year old's school backpack, with a few other survival goodies attached to a keyring for good measure (LED, small folding knife, FOB with vaseline-soaked cotton balls inside, Fox 40 and a quarter.)

She's been away for a week with friends, and last night I found her PSK/first aid kit on her dresser. The keychain is all but forgotten in the bottom of the bag, so at least it made the trip.