Most airlines allow a personal item to be 18 x 14 x 8 inches, which is how big a backpack can be on a plane if you want to keep it under the seat in front of you. If you choose a larger bag, it must fit in the overhead bin.
The main factor deciding if your bag flies is the airline’s specific policy, not just the size of the bag. A common mistake is assuming that all “carry-on” bags have the same size limits across every airline. You should always check the airline website before you head to the airport.
Packing your backpack for the plane
- Measure your empty backpack from the bottom to the top and side to side to ensure it meets the airline’s specific dimensions.
- Place your heaviest items at the bottom of the bag to keep the center of gravity low, which makes the bag easier to carry and store.
- Remove any prohibited items, such as large liquids or sharp tools, to avoid delays at the security checkpoint.
- Compress your clothing using packing cubes to reduce the total volume of your gear if the bag is near its size limit.
- Check the Transportation Security Administration guidelines for the current rules on what you can legally pack in your carry-on luggage.
Tip: If you’re traveling with a laptop, keep it in an easy-to-reach pocket so you can pull it out quickly during security scans.
Tip: Weigh your bag on a home scale before leaving; some carriers charge extra fees if your carry-on exceeds 22 pounds.
Flight Size and Weight Limits
The time it takes to prepare your bag depends on how strictly your airline enforces its rules. Some budget carriers measure every bag, while others are more relaxed.
| Airline Class | Typical Max Size | Typical Weight Limit | What to Watch For |
|---|---|---|---|
| Personal Item | 18 x 14 x 8 inches | No set limit | Must fit under seat |
| Standard Carry-on | 22 x 14 x 9 inches | 22 to 35 pounds | Handle and wheel size |
| Premium Cabin | 22 x 14 x 9 inches | 35 to 50 pounds | Varies by airline |
If your bag is significantly larger than the limit, you may be forced to gate-check it, which often costs more than paying for a checked bag in advance.
Checking if Your Bag Fits
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You can tell if your bag is acceptable by using the airline’s metal sizing bin found at the boarding gate. If your backpack slides into the frame without you needing to force or push it, it meets the requirements for that specific flight. The most reliable way to know is to measure your bag when it’s fully packed, as the fabric will bulge and change the dimensions compared to an empty bag. If you can’t close the zippers or the bag is clearly wider than the sizer, it’s too big.
Common Mistakes That Cause Delays
- Ignoring the wheels and handles: Many people measure only the main compartment, but airlines count the total exterior dimensions including wheels. Measure from the very edge of the wheels to the top of the handle to avoid being caught at the gate.
- Overstuffing the outer pockets: A bag that’s technically the right size while empty can become too large when you fill the external pockets. Only use the main compartment for bulky items and keep outer pockets flat to maintain the bag’s profile.
- Assuming gate check is free: Some travelers think they can just check their bag at the gate for free if it doesn’t fit. In reality, many budget airlines will charge a heavy premium for gate-checked bags, costing much more than a standard checked bag fee.
Related guides
- What Size Backpack Can I Bring on a Plane: Airline Rules
- What Size Backpack Can I Take on a Plane: Official Limits
- What Is the Largest Backpack: Expedition Pack Size Limits
Frequently Asked Questions
Can I bring a hiking backpack as a carry-on?
Yes, you can bring a hiking backpack if its total dimensions are within the airline’s carry-on limits. Most large hiking packs have rigid frames that can’t be compressed, so verify the frame length before you head to the airport to ensure it fits in the overhead bin.
What happens if my backpack is one inch too big?
It depends on the gate agent’s discretion, but you may be required to pay a fee to check the bag. If the flight is full, the agent is much more likely to enforce strict size limits to ensure everyone has space, so don’t rely on a “maybe.”
Is there a limit on how many backpacks I can bring?
Yes, most airlines limit you to one carry-on bag and one personal item. If you carry two backpacks, you’ll usually be asked to combine them into one or check the larger bag, which could result in an extra bag fee at the boarding gate.
How do I measure a soft-sided backpack?
Measure the bag while it’s fully packed, as the soft fabric will expand to its maximum size. You should use a flexible tape measure and pull the bag taut at its widest points to ensure the measurement reflects the actual space the bag will take up in the bin.
Do I need to weigh my backpack before the flight?
Yes, you should weigh your bag if you’re flying with a budget airline that has strict weight caps. While many domestic US airlines don’t weigh carry-ons, international carriers often have a 22-pound limit, and they will charge you if you exceed that specific threshold at check-in.
Can I carry a backpack and a purse?
Yes, you can usually carry both as long as one fits under the seat and the other goes in the overhead bin. The total number of items is the key, so ensure the purse fits inside the backpack or counts as your one allowed personal item.
Conclusion
Always verify your specific airline’s requirements online before you leave for the airport. Policies change frequently, and the rules for a regional flight may differ from those on an international trip. Checking the carrier’s official app or website the day before your flight provides the most accurate information for your journey.