You shouldn't have to worry about your kit, and it's difficult to find a reliable holster which allows you to draw quickly and consistently without the fear of losing your grenade while making a run.
Introducing the Project Airsoft 38mm Paper Based Smoke Grenade Holster.
This holster is purpose built to fit standard sized Enola Gaye (EG) strike top and ring pull smoke grenades and MkIII flash bangs, but will fit any 38mm pyro. They come in both molle and cable tie attachment options, both keeping it securely attached to your rigging throughout your game days.
Note: Smoke grenade not included. Shade of colour may vary slightly.