The Pic Stik ($6.99 street) is made of Lexan, holds up to five picks, and clips to your guitar strap with smooth, tight clamps that won't damage woven or leather materials.
Molenda, Michael (2014) Pic Stik. In: Guitar Player, Vol. 48, No. 10, pp. 122. Available at https://openmusiclibrary.org/article/765334/.