I have recently had the good fortune of utilizing a new and useful product. It is called the CellKeeper. This is a wallet and holster in one. The particular model I was using was the professional model. The following is a description from their site about the Professional Smooth Black model I am using:

This larger model CellKeeper comes in butter smooth and supple black genuine leather with silver-plated hardware & halter square. Adapts to your preference of cross shoulder or waist positioning. Features include: extra-wide pocket flap with expandable snap closure, adjustable shoulder strap, id window, key hook, zippered internal coin pocket, lip gloss / pen sleeve, 3 credit card sleeves, internal cash pocket, exterior pocket to hold all your portable electronics. Elasticized side panels of pocket expand to fit any size cell phone, iPod, Blackberry, Treo, pocket PC and digital camera. Fabrication: Genuine Leather with plastic hardware & halter square. Dimension: 3″W x 4 1/2″H x 1 1/4″D 

I used the CellKeeper for a week before I decided to write a review about it and it held up to its claims. Although there are not enough card slots in it for my daily use, it was more than ample for quick outings and I will definitely use it again when I travel. During the course of the week I upgraded my phone from a Katana to a Blackberry Curve and the CellKeeper Professional held both devices just fine. I used the CellKeeper during the hustle and bustle of my Christmas shopping. It easily detached from the belt clip, accessed my credit and debit cards with ease, the cashiers were able to plainly see my ID, and my phone stayed securely in the CellKeeper the entire time.

For any of you who travel for business, take vacation, go to the gym, or venture on an all day outing, the CellKeeper fits the bill. Quickly and handily take your phone, a few bucks, credit card or two and your ID all in one holder. The CellKeeper Professional is sturdy, convenient, and efficient and I have no reservations recommending it to the entrepreneur on the go. They sell the Professional model for $29.95. For more information visit www.cellkeeper.com.