Can You Bring a Backpack on a Plane?

Direct Answer (2026 Official Rules)

Cabin: ✓ YES Hold: ✓ YES

Yes — you can bring backpack on a plane in your carry-on luggage. Security: unlimited bag types.

Verified against published 2026 TSA (United States) & CATSA (Canada) security screening databases.

On this page · 10 sections

⚖️ Why This Rule Exists: Cabin Security, Blade Restrictions & Sterile Area Integrity

Non-bladed tools under 7 inches (18 cm), blunt items, and general travel gear that do not pose a cutting, impact, or hazardous materials risk are permitted in carry-on luggage.

Decision Threshold: Permitted in carry-on if non-sharp or under legal length thresholds.

Rules by security authority

United States — TSA

Carry-on

Yes

Yes, a backpack is allowed — security has no bag-type rules. The airline decides whether it is your carry-on (overhead) or personal item (under seat).

Checked bag

Yes

Yes, backpacks can be checked — cinch all straps or use a cover so they do not snag the conveyor.

Rule conditions: Security: unlimited bag typesTwo backpacks on a plane = your allowance: 1 cabin bag + 1 under-seat personal item on most full-service airlinesBasic Economy (United) / ULCC fares: often personal item only — the second bag costs extraSizing: under-seat ≈ 18 × 14 × 8 in; overhead ≈ 22 × 14 × 9 in on most US airlines

Flying internationally? Security follows the country you depart from — the authority above applies at your departure airport. Customs at arrival is separate.

🔍 Security Checkpoint & X-Ray Screening Advice

Place large metal tools in the screening bin alongside electronics if requested by screening staff.

Learn more about scanner differences and traveler rights in our Airport Security Screening Guide →

⚠️ Common Traveler Mistake to Avoid

The Mistake: Assuming scissors or tools of any size are allowed without checking blade length from the pivot point.

How to Avoid It: Measure blade length: must be under 4 inches (10 cm in the US) or under 6 cm from pivot (in Canada).

✈️ Airline-Specific Rules & Baggage Limits

The two-backpack question is really a fare question: full-service economy includes cabin bag + personal item; United Basic (domestic) and every ULCC base fare include only the under-seat item. Compare all airlines below.

Delta Air Lines United Airlines American Airlines Southwest Airlines JetBlue Airways All 17 airlines →

How to Pack Backpack / Extra Bag for a Flight

Use the personal-item slot wisely: a 40-liter "personal item" backpack that fits 18 × 14 × 8 in covers a weekend trip with no carry-on fee on airlines like Delta, Alaska, and JetBlue. Duffel bags follow the identical size rules as suitcases.

Backpack / Extra Bag on a plane — FAQs

Can you bring a Backpack in a carry-on?

Yes, a backpack is allowed — security has no bag-type rules. The airline decides whether it is your carry-on (overhead) or personal item (under seat).

Can you pack a Backpack in checked luggage?

Yes, backpacks can be checked — cinch all straps or use a cover so they do not snag the conveyor.

Why are there rules for a backpack on a plane?

Non-bladed tools under 7 inches (18 cm), blunt items, and general travel gear that do not pose a cutting, impact, or hazardous materials risk are permitted in carry-on luggage.

Can I carry two backpacks on a plane?

Yes on most full-service airlines: one fits the overhead as your carry-on, the other fits under the seat as your personal item. On United Basic Economy and ultra-low-cost carriers, only the under-seat one is free.

What size duffel bag can I carry on a plane?

The same as a suitcase: about 22 × 14 × 9 in (56 × 36 × 23 cm) including external pockets on most US airlines. Duffels compress, so slightly oversized soft bags usually pass.

Do airlines have their own rules for a backpack?

Last verified: July 29, 2026

Verified against official sources. Rules change — for high-stakes items, confirm with your airline and the screening authority. Our verification method →