Your fit result

Does Thule Subterra 2 Travel Backpack 26L fit Southwest Airlines?

This page compares the bag dimensions we have against one published airline rule, renders the fit to scale, and keeps the caveats visible.

Personal item

Thule Subterra 2 Travel Backpack 26L

Does not fit

Thule Subterra 2 Travel Backpack 26L is larger than the estimated personal-item dimensions. Pick a smaller alternative for this airline rule.

Visual sizer

Bag vs airline rule

Does not fit

Does not fit. Largest overage: 12.0 in.

Height

Spare room +2.7 in

Bag 13 in / Rule 15.7 in

Width

Spare room +2.2 in

Bag 9.6 in / Rule 11.8 in

Depth

Over by 12.0 in

Bag 19.9 in / Rule 7.9 in

warning: This result uses medium-confidence source data.
info: No exact personal-item dimensions in checked source; placeholder is not official
warning: This airline does not publish exact numeric personal-item dimensions; the visual uses a conservative under-seat estimate.

Bag: 13 x 9.6 x 19.9 in
Rule: 15.7 x 11.8 x 7.9 in
Risk: 92/100
Confidence: medium

Margins: length 2.7 in, width 2.2 in, depth -12 in.

Main issue: depth by 12.0 in.

Bag data

Audited dimensions

Last reviewed: 2026-05-29
Dimension confidence: high
Primary source: manufacturer

Airline rule data

Source-linked rule

Last reviewed: 2026-05-28
Rule confidence: medium
Airline rule: Airline baggage page

View bag details View airline rules Suggest correction

Better-fitting alternatives

Personal item

CabinZero Classic Cabin Backpack 28L

Fits

CabinZero Classic Cabin Backpack 28L fits the estimated personal-item dimensions for this rule. Still measure the packed bag, including handles and wheels.

Bag: 15.4 x 11.6 x 7.9 in
Rule: 15.7 x 11.8 x 7.9 in
Risk: 8/100
Confidence: medium

Margins: length 0.3 in, width 0.2 in, depth 0 in.

Bag details

Personal item

Rick Steves Civita Day Pack

Fits

Rick Steves Civita Day Pack fits the estimated personal-item dimensions for this rule. Still measure the packed bag, including handles and wheels.

Bag: 14 x 11 x 5.5 in
Rule: 15.7 x 11.8 x 7.9 in
Risk: 8/100
Confidence: medium

Margins: length 1.7 in, width 0.8 in, depth 2.4 in.

Bag details

Personal item

CALPAK Luka 15 inch Laptop Backpack

Risky

CALPAK Luka 15 inch Laptop Backpack is over the estimated personal-item dimensions, but the soft construction may make it a borderline option if lightly packed. Treat this as a fee-risk result.

Bag: 16 x 12 x 7 in
Rule: 15.7 x 11.8 x 7.9 in
Risk: 48/100
Confidence: medium

Margins: length -0.3 in, width -0.2 in, depth 0.9 in.

Main issue: length by 0.3 in, width by 0.2 in.

Bag details