BagCheck compares the three exterior measurements in the best physical orientation. It does not invent a missing axis label or assume that unknown protrusions are included.
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Metric specifications used as published; rounded imperial equivalents are not alternative geometry. Nylon and X-Pac weights remain distinct. Existing 20L V2 canonical identity retained and corrected to the explicitly specified nylon weight; no duplicate base model created. Evidence: research/weekly-launches-2026-09-08/snapshots/41072aa82d606fae.json; HTML SHA256 e8b77f089020423085d83959fc6b0c98dcf4601b99fe0ff8a1d35c160f74d9a0. Hardware inclusion and packed fit are not assumed.