I store all used needles, pins, rotary blades and even tacks and nails in a metal container. I tried taking a pill-box sized container of used needles to the pharmacy for sharps disposal but they wouldn't take them. Something about the actual transfer of sharp items from my container to the sharps container. That was my only try. I've been thinking I could take them to a public washroom that has a sharps container and put them in there but that doesn't feel quite right to me. Thank goodness they don't accumulate quickly.