No this isn't the start to a 90's rock song (Can't Live Without Your Love and Affection ..... Nelson..... Oh come on I know I wasn't the only one listening to it). It's what I have in my camera bag that I love to pieces. This isn't lenses or the camera body but the other stuff that makes taking photographs easier, better, etc.
First up Reynolds Oven Bag, Turkey size. Please don't stop reading! We like to take weather photography and this is the greatest thing for it. You cut a hole just large enough for you lens to see out of it. You can stick your head and camera in the big part and keep the rain away.
Next up is pony tail holders. Not only is it great for keeping my hair out of my face when I'm shooting but, you can also use them to attach your turkey bag to the camera lens. This will insure that the bag stays in place.
18% Gray Card. This is a must if you are shooting indoors, in my opinion. Taking those few extra minutes to set your white balance with one of these saves hours later adjusting your white balance.
Microfiber Cloths - They do a good job at keeping things clean and they are cheap enough that if you lose one it's not a big deal.