Track unexpanded vs expanded dimensions. | Official Knack page shows 17L unexpanded, 27L expanded, 17 x 12.5 x 5 in, and 2 lb 6 oz. | Launch-only softness, compressibility, opening, bottle-pocket, and price fields inferred from category and model.
Knack Bags Series 2 Small 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: 2.9 in.
Dimension-only silhouette
Fits. Tightest spare room: 2.9 in.
Height
Spare room +4.7 in
Bag 17 in / Rule 21.7 in
Width
Spare room +3.2 in
Bag 12.5 in / Rule 15.7 in
Depth
Spare room +2.9 in
Bag 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
17 x 12.5 x 5 in
Rule
21.7 x 15.7 x 7.9 in
Risk
8/100
Confidence
medium
Margins: length 4.7 in, width 3.2 in, depth 2.9 in.
Knack Bags Series 2 Small Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
17 x 12.5 x 5 in
Rule
21.7 x 13.8 x 9.8 in
Risk
8/100
Confidence
medium
Margins: length 4.7 in, width 1.3 in, depth 4.8 in.
Knack Bags Series 2 Small Expandable Backpack fits the published personal-item dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
17 x 12.5 x 5 in
Rule
17.7 x 13.8 x 7.9 in
Risk
8/100
Confidence
medium
Margins: length 0.7 in, width 1.3 in, depth 2.9 in.
Knack Bags Series 2 Small Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
17 x 12.5 x 5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 4.7 in, width 3.2 in, depth 4.1 in.
Knack Bags Series 2 Small Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
17 x 12.5 x 5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 4.7 in, width 3.2 in, depth 4.1 in.
Knack Bags Series 2 Small Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
17 x 12.5 x 5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 4.7 in, width 3.2 in, depth 4.1 in.
Knack Bags Series 2 Small Expandable Backpack fits the published carry-on dimensions for this rule. Still measure the packed bag, including handles and wheels.
Bag
17 x 12.5 x 5 in
Rule
21.7 x 15.7 x 9.1 in
Risk
8/100
Confidence
medium
Margins: length 4.7 in, width 3.2 in, depth 4.1 in.