Bag

Thule Subterra Backpack 21L

Verified exterior (published) specs for this product. Thule · Personal item / underseat. Not manufacturer-endorsed.

Exterior dimensions

Exterior L×W×D (cm)
45.97 × 32 × 20.07 cm
Exterior L×W×D (in)
18.1 × 12.6 × 7.9 in
Measurement basis
Packed exterior
Includes wheels / handles
wheels: no · handles: yes
Last verified
9/28/2026, 10:35:00 PM ET
Verification
Manufacturer source verified (high confidence)

Manufacturer product page ↗(non-affiliate)

Airlines this bag fits (gated)

Only CabinOK and Depends on Fare / Ticket from evaluate + publish gate (MEDIUM+). LOW confidence never shows as CabinOK.

Depends on Fare / Ticket (1)

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