Invisible stash

Skinflint spoiled that some suspicious guys walked in recently, and told him about a stash that can be barely seen, as the rucksack was made from a special fabric invented by one of the scientists researching the Zone. The stash is musical, and possibly located somewhere at the bandit base in Dark Valley.
== Walkthrough ==
The location of the stash is in the video below. (1:33)
Technically the quest completes after taking it, but the note inside the stash says that there's another stash with the audio cue. This leads to a chain of 3 stashes, also shown in the video.
The last of the stashes contains the note directing you to Eastern Pripyat to continue the chain, and providing the audio cue to search for.
== Notes ==
== Bugs ==