Quick Answer
✅ Usually yes. Most airlines allow one carry‑on bag plus one personal item (like a backpack, purse, or laptop bag). The backpack must be smaller than your carry‑on and fit under the seat in front of you.
Details
- Typical allowance: 1 carry‑on (overhead bin) + 1 personal item (under‑seat).
- Personal item (backpack) size is usually around 17–18 × 13–14 × 8 inches (43–45 × 33–35 × 20 cm).
- If your backpack is large/overstuffed, gate agents may count it as your carry‑on.
- Basic Economy on some airlines may restrict you to a personal item only—always check your fare rules.
Gotchas / Common Issues
- Bulky photography or gaming backpacks may be too big for “personal item.”
- Low‑cost carriers (e.g., Ryanair, Wizz Air) often allow only one small under‑seat bag unless you pay for priority.
- If you bring duty‑free shopping, that may effectively become your “personal item” on stricter airlines.
Sources
American Airlines – Carry‑On Policy
United Airlines – Carry‑On Bags
Ryanair – Baggage Policy