Backpack on roof

 is a stash featured in S.T.A.L.K.E.R.: Lost Alpha.

"I'll throw my stuff on the roof, it's not like the dogs can get it..."

- PDA description

Overview
The stash coordinates are gained by looting a corpse and is located southeast of the Sarcophagus entrance. The in-game description can be misleading as the backpack is actually against the southern wall of the main building. Technically, the "roof" is of a cement block outcropping near the east end of the main building that has a vehicle ramp on the west side.