[Groombug]

I need your address so I can mail you a giant wooden spoon.

CIRAS-Land has an integrated cumberbund that wraps around the front and is secured with a triple velcro flap. It was designed for combat applications on terra firma. Advantages include that you can attach additional pouches or whatever under the cumberbund, doubling the real estate up front. It's also a little easier to put on, especially when you have armour and loaded pouches. Disadvantages include the unavoidable cumberbund sag, especially if you don't know shit about where and how to put your pouches. The release pillow is also placed to one side or another, making it harder for you to do an opposite-hand release.

The CIRAS-Maritime was designed for wetter applications, as well as being applicable in land operations. You can see that the Maritime has a relatively slimmer profile compared to the Land. Among other things, it's to fit through tight ship compartments for VBSS.

Maritime advantages include the ambidextrous release pillow located top or bottom of the rig and a slimmer mounting area compared to the girth of a loaded Land. Disadvantages include a lesser amount of PALS real estate, and a somewhat limiting front-side-back configuration for locating pouches, etc. The side flaps are also a little harder to put on, especially if you have armour in and have to don it by yourself.

Both Land and Maritime are suitable for airsoft, since you're not going to carry your entire life on one rig. I personally chose the Maritime since I already have a RAV, which also has an integrated cumberbund.