Post-it Page Markers (for memory cards)
Is this madness or is a great way to speed up your card changes!
Before going out on a shoot you should ensure that all the cards you plan to use are checked formatted and stored correctly.
However after re-formatting your card place a Page Marker post-it around your memory cards. (Avoiding the metal contacts on the card) Then place the card in its little plastic case and stash it in its storage location for the shoot. (Avoiding the metal contacts on the card) Then place the card in its little plastic case a stash it in its storage location for the shoot.
When you are out on your shoot and you grab a card from your bag if it has a Post-it page marker on the card then you know the card is a "clean" unused card. You know you'll be safe using this as it contains no images and is formatted.
This will make sure you get fast card changes, and the green and yellow Post-its ones show up well in the dark.
Do make sure you dispose of the page marker properly