Most airlines let you bring two bags: a carry-on that goes in the overhead bin and a personal item that goes under the seat. Simple enough in theory — but travelers constantly run into questions about what actually qualifies as each, how strictly the size limits are enforced, and what happens when your bag doesn’t fit. Here’s the honest breakdown.
Carry-On + Personal Item: Quick Summary
- Allowed on most airlines: ✅ Yes — 1 carry-on + 1 personal item
- Personal item goes: Under the seat in front of you
- Carry-on bag goes: In the overhead bin
- TSA involvement: TSA does not regulate carry-on counts — airlines do
- Exceptions: Basic Economy fares on some airlines (American, United, Delta) restrict you to personal item only
What Is a Personal Item?
A personal item is a smaller bag that must fit under the seat in front of you. Common personal items include:
| Item | Counts as Personal Item? |
|---|---|
| Small backpack (under seat size) | ✅ Yes |
| Laptop bag or sleeve | ✅ Yes |
| Purse or handbag | ✅ Yes |
| Tote bag | ✅ Yes |
| Briefcase | ✅ Yes |
| Camera bag | ✅ Yes |
| Diaper bag | ✅ Yes (usually free even on Basic Economy) |
| Duffel bag (small) | ✅ Yes (if it fits under seat) |
| Rolling carry-on suitcase | ❌ No — that’s a carry-on, not a personal item |
| Full-size backpack | ❌ No — usually too large for personal item |
Personal Item Size Limits by Airline
Each airline defines its own personal item size limit. These are the most common restrictions:
| Airline | Personal Item Size Limit |
|---|---|
| American Airlines | 18” x 14” x 8” |
| Delta Air Lines | Must fit under seat (no published dimensions) |
| United Airlines | 17” x 10” x 9” |
| Southwest Airlines | Must fit under seat |
| JetBlue | 17” x 13” x 8” |
| Alaska Airlines | 17” x 13” x 6” |
| Spirit Airlines | 18” x 14” x 8” |
| Frontier Airlines | 18” x 14” x 8” |
| Ryanair | 40 x 20 x 25 cm (personal item is the FREE bag) |
| easyJet | 45 x 36 x 20 cm |
| Lufthansa | 40 x 30 x 10 cm (second carry-on) |
[!IMPORTANT] Size limits are enforced at the gate on some airlines (especially Spirit and Frontier) using bag sizers. If your personal item doesn’t fit, you’ll be charged to check it — often $99+ at the gate.
Carry-On Bag Size Limits by Airline
The standard carry-on size is 22” x 14” x 9” (56 x 36 x 23 cm), but airlines vary:
| Airline | Carry-On Size Limit | Weight Limit |
|---|---|---|
| American Airlines | 22” x 14” x 9” | None (domestic) |
| Delta Air Lines | 22” x 14” x 9” | None (domestic) |
| United Airlines | 22” x 14” x 9” | None (domestic) |
| Southwest Airlines | 24” x 16” x 10” | None |
| JetBlue | 22” x 14” x 9” | None |
| Spirit Airlines | 22” x 18” x 10” | 40 lbs |
| Frontier Airlines | 24” x 16” x 10” | None |
| Ryanair | 55 x 40 x 20 cm | 10 kg (with Priority boarding) |
| British Airways | 56 x 45 x 25 cm | 23 kg |
| Emirates | 55 x 38 x 20 cm | 7 kg |
Basic Economy: When You Can Only Bring a Personal Item
This is the most important exception. Basic Economy fares on the three major U.S. carriers restrict carry-on bags:
| Airline | Basic Economy Carry-On Rule |
|---|---|
| American Airlines Basic Economy | Personal item only. No overhead carry-on unless you have status or co-brand credit card |
| United Airlines Basic Economy | Personal item only. No overhead carry-on |
| Delta Basic Economy | Personal item only on most routes. No overhead carry-on |
[!WARNING] If you book Basic Economy and show up with a carry-on bag expecting overhead bin space, you will be required to check it and pay the checked bag fee (typically $35–$65) at the gate.
Southwest Airlines does NOT have Basic Economy — all Southwest fares include one carry-on + one personal item + two free checked bags.
Can You Bring Both a Carry-On and Personal Item on International Flights?
Yes — international flights follow the same one carry-on + one personal item rule, but weight limits are more commonly enforced by international carriers:
- European carriers (Ryanair, easyJet, Wizz Air) are particularly strict — often your personal item IS your only free bag, and carry-ons require purchasing a “priority” fare add-on
- Middle Eastern carriers (Emirates, Qatar, Etihad) allow one carry-on + one personal item with generous weight limits (7–10 kg)
- Asian carriers (Singapore Airlines, ANA, JAL) typically allow 7–10 kg carry-on + personal item
Tips to Maximize Your Carry-On + Personal Item Allowance
- Pack your personal item last — fill your carry-on first, then use the personal item for overflow, valuables, and in-flight essentials
- Use a structured personal item — a laptop backpack or organized tote holds far more than a slouchy bag
- Know your fare class — always check if your ticket includes overhead bin access before packing
- Wear your heavy items — jacket, boots, and heavy sweaters don’t count toward bag limits when worn
- Use packing cubes — compress clothing in your carry-on to maximize space for your personal item to hold overflow
- Pack compliance-sensitive items securely — pack your electric toothbrush, protein powder, and quart-sized liquids bag at the top of your bag for fast checkpoint access (or get TSA PreCheck to avoid unpacking altogether).
What If I Have More Than 2 Bags?
If you have more than one carry-on and one personal item:
- You must check the extra bags (fees apply — typically $30–$65 per bag)
- Gate agents will ask you to check overflow bags if overhead bins are full
- Do not try to bring two carry-on bags — gate agents actively count and size-check bags
Frequently Asked Questions
Q: Can you bring a carry-on and a personal item on every flight? A: On standard fares, yes. On Basic Economy fares with American, United, or Delta, you are limited to a personal item only unless you have elite status or a co-brand credit card.
Q: What counts as a personal item? A: A small backpack, purse, laptop bag, briefcase, camera bag, or tote that fits under the seat in front of you. The exact size varies by airline but is typically around 18” x 14” x 8” or smaller.
Q: Can I bring a personal item AND a carry-on for free? A: On most airlines with standard fares, yes — both are included in your ticket price. On ultra-low-cost carriers like Spirit and Frontier, carry-on bags cost extra (personal items are free).
Q: Does a purse count as a personal item? A: Yes. A purse is the quintessential personal item. As long as it fits under the seat, it counts as your personal item.
Q: Can I use my personal item as a second carry-on in the overhead bin? A: No. Personal items must go under the seat. If you put your personal item in the overhead bin, a flight attendant will likely ask you to move it.
Q: What if I have a medical bag or baby diaper bag? A: Medical bags and diaper bags are typically allowed as a free additional item on top of your carry-on and personal item. Inform the gate agent if you are traveling with a medical device bag.
Conclusion
The standard rule across virtually every airline is one carry-on bag + one personal item per passenger. The carry-on goes overhead; the personal item goes under the seat. The biggest exception is Basic Economy fares, which restrict you to a personal item only. Always check your specific fare class and airline rules before you pack — especially on ultra-low-cost carriers where carry-on bags cost extra.
See Also
- What Is TSA PreCheck? Full Benefits & Rules Overview
- TSA PreCheck Guide — Skip the Shoe Removal Line
- TSA 3-1-1 Liquids Rule for Carry-On Bags
- Can You Bring an Electric Toothbrush on a Plane?
- Can You Bring Protein Powder on a Plane?
- TSA Wait Times at Major Airports