Either hard case with some padding (but not too much a I am still looking for a "thin" case) Otherwise thick fabric would work as well.
Any suggestions ?
I am beginning the same sort of search. Long time ago, I carried my Handspring Visor around in a case made by Granite Gear, I think. It zipped open to reveal two internal pockets with mesh additional pockets. Flat enough to slip into a briefcase, but also belt-looped. I cannot find it, but think it is still bigger than I need. But something like that would be great. Found this clunker over at Headroom. It has its merits, but is much bigger than I need for either my iPhone/Mustang, or iPod/Viper.
Amazon.com: Samba Travel Case for JBuds J2 Earbuds (Black): Electronics
depends on the size of the amp, but this case fits my ipod classic and arrow perfectly with just enough room for my LOD
Hippo case is not really convenient, im looking for something like this