Abstract: A dental laboratory die tray having first and second side members and a bottom member with the side members being joinable to form a housing with an open top and an open bottom, and with the bottom member being holdable between to the side members to close the open bottom when the side members are in a housing closed position. The side members may be moved away from each other to a partially closed position permitting removal and reinsertion of the bottom member, thereby providing a die tray with a closed bottom for some operations and with an open bottom for other operations.