Likely carry-on-only. | Official Knack page shows 30L unexpanded, 46L expanded, 21.5 x 14 x 4.5 in, and 3 lb 4 oz. | Launch-only softness, compressibility, opening, bottle-pocket, and price fields inferred from category and model.
Knack Bags Series 2 Large Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Visual sizer
Bag vs airline rule
Fits
Fits. Tightest spare room: 0.2 in.
Dimension-only silhouette
Fits. Tightest spare room: 0.2 in.
Height
Spare room +0.2 in
Bag 21.5 in / Rule 21.7 in
Width
Spare room +1.7 in
Bag 14 in / Rule 15.7 in
Depth
Spare room +3.4 in
Bag 4.5 in / Rule 7.9 in
warning: This result uses medium-confidence source data.
Data status
Audited dimensionsSource-linked rule
Rendered from the dimensions shown here. Airline staff and packed shape can still affect the real-world outcome.
Dimension-only silhouette rendered from verified dimensions; no approved product image is available yet.
Bag
21.5 x 14 x 4.5 in
Rule
21.7 x 15.7 x 7.9 in
Risk
8/100
Confidence
medium
Margins: length 0.2 in, width 1.7 in, depth 3.4 in.
Knack Bags Series 2 Large Expandable Backpack is over the published carry-on dimensions, but the soft construction may make it a borderline option if lightly packed. Treat this as a fee-risk result.
Bag
21.5 x 14 x 4.5 in
Rule
21.7 x 13.8 x 9.8 in
Risk
48/100
Confidence
medium
Margins: length 0.2 in, width -0.2 in, depth 5.3 in.
Knack Bags Series 2 Large Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
21.5 x 14 x 4.5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 0.2 in, width 1.7 in, depth 4.6 in.
Knack Bags Series 2 Large Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
21.5 x 14 x 4.5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 0.2 in, width 1.7 in, depth 4.6 in.
Knack Bags Series 2 Large Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
21.5 x 14 x 4.5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 0.2 in, width 1.7 in, depth 4.6 in.
Knack Bags Series 2 Large Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
21.5 x 14 x 4.5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 0.2 in, width 1.7 in, depth 4.6 in.