Yes, both my husband and I bring one of those nylon ones. I think I bought it at WalMarts. My husband also has a leather one for his digital camera.
I also just found a little small purse, about the size of a wallet with a long strap to hold my boarding card, credit card and some money. I usually strap this across my body and keep it in front of me. I had a real problem finding one, but alas found it at WalMart.
I definately bring a nylon beach bag if we do any excursions for suntan lotion, hat, glasses, towel etc.
I would pack a fanny pack, just in case you want to use it.