Seem to me if you're picking up litter possibly including needles/syringes you don't want the sort of complicated sharps containers you see at a medical clinic, where you have to operate some sort of trap door mechanism.

You want something simple, like a bucket, maybe with a funnel type opening, so that you can pick up the syringe with a grab tool and just drop it into the container with a minimum of handling or manuvering required.

Doctors and nurses who are practiced at handling sharps still stick themselves occasionally. You really don't want to touch them with your hands, even with gloved hands.