If they are Bianchi Speed Strips, the .38/.357/9mm are the same strip.old fart....will a 357-38 speed strip be ok for the 9mm?
I won't bost that it's the best but take a look at small flexible narrow "eye-glass" cases. They are the type that are about 1.5" wide x 6" long, made of a flexible soft fabric. I use them to carry an extra mag. I pick them up at Godwill, for .50 cents a piece. They come in all coors and some have fancy patters. For your use, I suspect you could carry two speed stips.What is best to use to carry extra ammo?