Donation

Hello.. since I will be leaving Gangtok in a few months I would like to donate some of my stuff. Since it will difficult to take all of this back home or leave it at my rented house. I have seen people throw bags of clothes on the roadside or drains.. I don't know why.. Aren't there any NGO's or anything in Gangtok area that take useful household items, books, clothes etc as donation for the underprivileged who live either in Sikkim or outside Sikkim.