Briggs & Riley ZDX Cargo Backpack × 
Frontier Airlines personal item
Close.
Bag 18 x 12 x 8.8 in · Rule 18 x 14 x 8 in · high confidence
Bag reviewed 2026-05-29 · Rule reviewed 2026-05-28
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Fit proof
Height
Exact
Width
+2 in
Depth
Over 0.8 in
Rendered to scale from the reviewed dimensions above. Packed shape and gate enforcement can still change the outcome.
Why this answer
Briggs & Riley ZDX Cargo Backpack is over the published personal-item dimensions, but the soft construction may make it a borderline option if lightly packed. Treat this as a fee-risk result.
The selected rule is 18 x 14 x 8 in and the bag record is 18 x 12 x 8.8 in.
Next step
Briggs & Riley ZDX Cargo Backpack is borderline for Frontier Airlines's personal item rule. Check the buying options only if the margin and packed-shape risk are acceptable.
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1 in spare on height, the tightest side
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0.1 in spare on depth, the tightest side
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