I used to buy plectrums/picks very often, because I kept losing them. Since I discovered self adhesive velcro tape (hook & loop)I have stopped buying them. I stick a small piece of the 'hook' (rough') velcro on the pick, and a corresponding sized small piece of the 'loop' (smooth) on some inconspicuous place on guitar or banjo. Then park pick on instrument (I usually have two on each instrument - luxury!) Ready for instant use! The rough velcro means it is much less likely to slip out of sweaty fingers!