BagCheck compares the three recorded 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
Product-owned spec block and JSON-LD only. Published triple is unlabelled, so publishedAxisOrder is null, dimensionSemantics UNSPECIFIED and dimensionsCm keeps the printed order, converted inches x 2.54 without rounding. Capacity 18 L comes from the spec row (and JSON-LD Capacity 18L); the meta description's 22L (copied Boston text) and a video tag 21L are excluded. No weight is published. emptyWeightKg is null: the page publishes a weight without stating an empty-bag basis (maintained weight-scope contract; retained as an observation only).