If you are looking for a map case, look no further. This map case tops my list as my favorite over the years- and I have carried many.
The SealLine HP Map Case is made of very thin urethane material that is strong enough to survive hanging out of your pocket while bushwhacking along the John Day or floating down the Columbia. The material is crystal clear, the map inside is easy to read. I hope it stays this way- the previous version of the HP map case yellowed and hardened with exposure to the sun. The new version is a completely different material and I think this is one of the reasons for the re-design.
The new version, just out this fall, has a roll top with a velcro strip that holds the roll tightly together. I had the case completely under water many times and only once, after a long wade across deep, fast water, was there the slightest bit of moisture in the outer-most roll when I opened the case later.
The case has two buckles and a strip of web to hang around the neck. I removed the web and ran a piece of 550 cord through one of the loops to secure the case to my belt loop. The case also has 4 tabs, one in each corner for tying onto the deck of your kayak perhaps, or the pack of the man in front of you. As I would never use them, I cut off the tabs straight away (extra weight).
The case is available at backcountry.com in two sizes, small and medium, at $16.95 and $19.95 dollars respectively. The small case weighs 2 ounces, the medium 2.5 ounces, and the large weighs 5 ounces. Inner dimensions are 9.5 inches by 12.25 inches for the small, 13 inches by 15 inches for the medium, and 14 inches by 21 inches for the large.
The small size accepts a USGS 1:24,000 mapsheet with the margins cut off. The mapsheet can be folded in half on both axes and slid right into the case.