As others have mentioned, the red cards are difficult to read. The cards themselves are about 5mm/0.25" narrower and 2mm/0.1" shorter than standard playing cards. Being carbon fiber, they are very stiff and almost impossible to shuffle. I bought these because I collect playing cards and I was curious. For anyone else, it isn't worth the cost. I don't recommend these for anyone unless you're REALLY into carbon fiber, or need to cut bananas in a pinch? (hopefully that image is still in the gallery when you read this or that won't make sense :3)
If you need durable playing cards, they make waterproof/plastic ones for about $6 USD. They're usable (you can actually shuffle them) and can be found at almost any drug store. If you're looking for something with a bit of style, look up Theory11. They make decks with beautiful tuck boxes and good quality playing cards. They aren't necessarily the best, but it's a good starting point and definitely enough to impress your friends. If you need anything fancier, there's a whole world of playing cards out there (it's a trap!) to explore. You can certainly find something that fits your aesthetic for less than 1/5th of the cost of these.
BigbeardUnfortunately, the only ones I really know about are the same ones you'll find wherever you can purchase regular playing cards (drug stores/Walmart/Amazon/etc). There are several under the Hoyle brand name. Bicycle Prestige are also plastic. If none of those are what you're looking for and you don't mind something a bit different, there's also the Air Deck. They're basically the size of a standard playing card cut in half vertically. It looks like you can find them on Amazon now. The company is called TipTop Things.
nsuffieldArt of Play is another good place to find playing cards. They also have puzzles, games and other neat trinkets if you're into that. What do you mean by travel caddies/boxes? Are you looking for something to keep a single deck protected in your pocket? Or more like something to carry around several decks of cards for a game night/poker night?
chrisamOh thanks ... Art of Play also looks good.
I was looking for robust protection for a single deck that I would regularly have with me ... anything to try to get the people off their phones. There are clips but these don't seem to offer a great deal of protection. Cheap nasty metal tins. Crystal magnetic ones are also out there but these seem to be more for display. I've seen wooden ones on Etsy and have also been trawling Ebay for antique ones. It seems like there is scope for really cool boxes.
nsuffieldClips are actually the most protection you'll probably get in terms of preventing warping and they provide a bit of impact protection. The down side is that they still expose 3 sides of the tuck box and can damage any embossing on it. These clear plastic boxes add some protection while still allowing you to show off the box, but I haven't tried them yet. You can also find deck wallets made of leather like this and this. This site seems to have a few other styles, but I've never bought anything from there myself.
If you wanted something more solid/rugged there aren't many good options that I'm aware of. For me personally, I've just accepted that my decks will get worn with use. Sometimes I'll use a deck wallet if I'm feeling fancy, but normally I just keep a deck in my backpack. That's enough protection for me. As long as you minimize damage to the tuck box, a good deck of cards will last a long time. Even if not, playing cards are cheap enough that I can just buy more when needed.
nsuffieldThere's something called "The Card Caddy" for less than $10 that will hold a deck of standard cards. They also make a double decker. I have the single and it's perfect for just tossing in your bag, pack or purse