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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Evidence
Authorized Thule evidence publishes 12.2 × 7.5 × 16.9 in L × W × H. Named axes transpose exactly to canonical 16.9 × 12.2 × 7.5 in H × W × D; 2.4 lb converts to 1.088621688 kg.