I keep a Benchmade H20 on mine. The Benchmade sheath is designed to fit in the lash tab, and it is snug and secure. The good folks at Benchmade were nice enough to send me an extra sheath so I can now just move my knife from my fishing PFD to my touring PFD without having to wrestle the sheath back out of the lash tab (did I mention it's snug and secure?).