Construction backpack

 is a stash featured in S.T.A.L.K.E.R.: Lost Alpha. "Sorry brothers, I tried my best, but these horrible creatures almost caught me. All I found during this journey to hell I'll will put in this rucksack. I hope I will be remembered..."

- PDA description

Overview
The stash coordinates are gained by looting a corpse and located at the very top of the Factory Construction Site.

Trivia

 * About the only stash that contains the exceptionally unuseful Doughboy artifact (the repurposed Kolobok)