Various embodiments of the present disclosure provide a reusable valve (10) in which a seal portion (124) is co-molded with and overmolded to the valve stem (30) to provide a secure mechanical bond therebetween. In one embodiment, the valve includes a snap fit between the valve stem (30) and a retaining cap (50) to provide easy assembly of the valve as well as an efficient and compact retention mechanism for a biasing spring (40) and the valve stem (30) in relation to the valve housing (20). In one embodiment, the valve includes an easy-to-use opening and closing mechanism that provides tactile feedback to the user when moving the valve stem to an open position and to a closed position to inflate, deflate, or maintain air or gas pressure in the inflatable article. The present disclosure also provides a dunnage bag with such valve.