Indeed, the "F" sheath is only available for the #25 (The Capt has confirm it to me some weeks ago). Sad that this sheath is not available with any of the knives, because I love that sheath. I was more thinking at the sheath as some model #10. The E will be great. but I have saw some model 10-3 with another pouch sheath. But, on another hand, the standart sheath will not make much problems because I always hold my knives in a pocket or in a bag. In anyway, thanks for all the answers.