Thule EnRoute Backpack 26L × 
Frontier Airlines personal item
No.
Bag 12.4 x 9.7 x 18.9 in · Rule 18 x 14 x 8 in · high confidence
Bag reviewed 2026-05-29 · Rule reviewed 2026-05-28
Fit proof
Height
+5.6 in
Width
+4.3 in
Depth
Over 10.9 in
Rendered to scale from the reviewed dimensions above. Packed shape and gate enforcement can still change the outcome.
Why this answer
Thule EnRoute Backpack 26L is larger than the published personal-item dimensions. Pick a smaller alternative for this airline rule.
The selected rule is 18 x 14 x 8 in and the bag record is 12.4 x 9.7 x 18.9 in.
Next step
Thule EnRoute Backpack 26L is not a strong match for Frontier Airlines's personal item rule. Use the alternatives below first, then review merchant dimensions before buying.
Frontier AirlinesFits this rule with 1 inches of tightest margin.
1 in spare on height, the tightest side
17 x 13 x 6 in
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0.1 in spare on depth, the tightest side
15.4 x 11.6 x 7.9 in
Fits this rule with 1 inches of tightest margin.
1 in spare on depth, the tightest side
16 x 12 x 7 in