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.
Source
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Evidence
External dimensions only. Published body-only mass excludes straps/partitions, so ready-to-use empty weight remains UNKNOWN, not zero. This is a scope exclusion, not selecting between conflicting weights. Hardware inclusion unknown; no compression or airline allowance inferred. Evidence: research/overnight-2026-09-07/snapshots/d6addd1b9eb3bb97.json; target TARGET-52.