Recommendation? D2 knife rusts too fast, need a new outdoor folder.

[The Grendels]

If you're out in the rain for days and in spots where you're getting sprayed by salt water a lot, you might want to look into something from the Spyderco Salt Series or a cheaper but still very reliable Spyderco Byrd Raven2 in CTS-BD1 steel (seen 3rd up from bottom in picture). As some others have mentioned, the RAT1 in Aus8 is also a decent choice. If you're in an environment that's a bit on the moist side, you also need to wipe them down more often.