Crossword Genius

Trade zip for pack's contents in obvious high camps (8)

Ross

I believe the answer is:

bivouacs

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'camps' is the definition.
('bivouac' can be a synonym of 'camp')

I cannot understand how the remainder of the clue works.

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(Other definitions for bivouacs that I've seen before include "Temporary military camps" , "Temporary living quarters for soldiers" .)

I've seen this clue in the Sydney Morning Herald.
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