Summary: Held 13 cards for me on a trip, with room for a few more. I bought it just because I like Tamrac's 'red flag' system so I don't confuse myself. It says ok for batteries, but I think it would be too bulky if you shoved batteries in.
Pros: Good Protection, Lightweight, Lots Of Pockets And Features, Weatherproof
Summary: This is a really handy way to keep track of memory cards and keep them all in one place. No more digging around to find one and then wondering if it is ready to go. It will fasten to the strap of a camera bag or fasten to a belt. Keep an eye on the snap. It is a little difficult to fasten. Mine came loose in the field. I might not have had it snapped securely. But the hook and loop fastener will hold the wallet in place.
Pros: Good Protection, Lightweight, Lots Of Pockets And Features
Summary: We use these packs all the time. They are great!At weddings, we carry 8 CF cards, 4 AA batteries and 2 Canon Camera batteries in each wallet comfortably. The little tags are great for quickly identifying used cards too.There is a long pocket in them too, but not entirely sure what its for. Would be good for pens I guess!