>>1221744Tin whistle, harmonica, those little african things you play with two thumbs, are all pretty cool and take up no room. I know martin and a few other companies make super lightweight guitars, but they're obviously a bit delicate so I'd be hesitant to bring one on a multi day. I've always thought it would be cool to bring a bass string and set up a washtub bass type instrument with found materials. It'd be cool to bust out if you had people who brought other instruments.