Will your backpack make it on board?

Carry-on and personal item are different allowances

A carry-on generally goes in the overhead bin. A personal item generally goes under the seat in front of you. The permitted size, weight and number of pieces depend on the airline, fare and operating flight.

Do not assume that “airline friendly” on a product page means underseat approved. Check the baggage policy attached to your booking, including any connecting carrier.

An airline example: 22 × 14 × 9 inches

Delta publishes a carry-on maximum of 22 × 14 × 9 inches, or 56 × 35 × 23 cm, including handles and wheels. Its policy also lists a 45-linear-inch total. This is a Delta example, not a universal allowance.

Delta allows one carry-on and one personal item on most flights under the published policy. The personal item must fit under the seat. Aircraft and itinerary restrictions can apply; check the linked policy before travel.

Measure the backpack after packing

A soft backpack can expand beyond its empty specifications. Packing cubes organize clothes; they do not increase the airline allowance.

• Pack the clothing, laptop, pouch and water bottle you will actually bring.
• Measure maximum height, width and depth, including protruding pockets, handles and bulges.
• Compare each measurement with your airline’s published limit. A small total does not cancel an overlarge individual dimension.
• Weigh the full bag if your carrier has a cabin weight limit.
• Leave some space rather than stretching every compartment to its limit.

Why liters cannot guarantee a fit

A tall 20L bag and a short, wide 20L bag may have different external dimensions. A 30L bag may be useful for an overhead carry-on, but its capacity alone cannot establish compliance.

For the Bellroy packs in our comparison, confirm the selected model’s current external dimensions on the manufacturer page. We do not label either model as universally underseat approved.