I keep anything capable... they get rinsed well, then tossed in a box. Once I've gotten a couple cases, I soak in oxy, remove the labels, rinse well, then store upside down in cases. Pull 'em out and sanitize as needed when I'm ready to bottle. I think I'm up to almost 300 bottles in the rotation... and climbing. Though a keezer is calling my name... I can hear it.