Best Personal Item Backpacks 2026: Fit Under the Seat, Pack Like a Suitcase

Bag fees keep going up. Overhead bins keep filling up. And on basic fares, the only free bag you get is the one that fits under the seat in front of you.

That's why the personal item backpack has become the smartest bag in travel. Pick the right one and you can fly for a long weekend, or even a week, without paying for a carry-on.

Here are the best personal item backpacks for 2026, checked against real airline size limits, and what to look for before you buy.

What is a personal item backpack?

A personal item is the small bag that goes under the seat in front of you. Most airlines include it free, even on the cheapest fares.

A personal item backpack is a backpack sized to fit that space. On many US airlines the limit is around 18 x 14 x 8 in (45 x 35 x 20 cm), but it varies a lot, so always check your airline. Our personal item vs carry-on size guide lists the limits for every major airline.

What to look for in a personal item backpack

1. The right size for your airline. Height is usually the deal-breaker. A bag that's 2 cm too tall can cost you a gate fee.

2. Clamshell opening. A backpack that opens 180° packs like a suitcase. You see everything at once, instead of digging from the top.

3. A separate laptop compartment. You can pull your laptop out at security without unpacking the rest of the bag.

4. Smart pockets. A spot for your passport, phone, cables and water bottle saves you from rummaging under the seat mid-flight.

5. A luggage pass-through strap. It slides over a suitcase handle, so you're not carrying everything on your back through the airport.

6. Water-resistant materials. Rainy tarmacs and wet pavements happen. Your laptop shouldn't care.

7. Room to track it. A pocket for a tracker card means you can find your bag if it's left behind or gate-checked.

The best personal item backpacks for 2026

1. GRID Backpack Pro: best personal item backpack overall

The GRID Backpack Pro is built for one-bag travel. At 26L it measures 45 x 29 x 17 cm, which sits within the 45 x 35 x 20 cm personal item limit used by American, Spirit, Frontier and easyJet.

Need more space for the trip home? Unzip the side expansion to 31L. Expanded, it's 21 cm deep, so treat it as a carry-on at that point. It still fits the common 55 x 40 x 23 cm cabin limit.

• 180° opening so you can pack it like a suitcase
• Padded, top-access laptop compartment for laptops up to 16"
• 7+ pockets, including a hidden passport pocket and a hidden top pocket for valuables
• Expandable kangaroo pocket at the bottom for shoes
• Luggage pass-through strap and an air-mesh back panel
• 600D water-repellent nylon, made with recycled PET bottles

Pair it with the TravelPack™ Vacuum Kit and it holds up to 50L of clothing, enough for 5–7 days.

SHOP THE GRID BACKPACK PRO

2. GRID Backpack: best slim personal item backpack

If you want one bag for the office and the plane, the GRID Backpack is the slimmer choice. It's 21L and just 15 cm deep, so it slides under the seat easily, and it's 18 x 12 x 6 in, right on the 18 x 14 x 8 in limit used by American, Spirit and Frontier.

• 180° access and a laptop pocket for devices up to 16"
• RFID-protected pocket for cards and documents
• Luggage pass-through strap and an air-mesh ventilated back panel
• 600D water-resistant recycled PET

Need more than a personal item?

For longer trips, the GRID Duffel Backpack converts from backpack to duffel and holds 43L. At 55 x 34 x 23 cm it's a full carry-on, not a personal item, so you'll need a fare that includes an overhead bin bag.

Will it fit? Personal item limits by airline

Here's how our two personal item backpacks compare with each airline's published limit, measured unexpanded. Soft bags have a little give, but airlines go by the numbers, so check your fare before you fly.

Not sure which one you're flying with? Read personal item vs carry-on: size limits by airline.

How to fit more in a personal item backpack

1. Vacuum pack your clothes. Clothes are mostly air. The TravelPack™ Vacuum Kit Pro saves up to 70% of the space, which is how a small backpack can hold a week of clothes.

2. Organize your tech. Cables and chargers take more room loose than you'd think. The GRID Tech Case keeps them flat, together and easy to grab.

3. Wear your bulkiest layer. A jacket and boots take up no room on you, and half your bag if you pack them.

4. Keep in-flight items on top. Headphones, a water bottle and your passport should come out without opening the main compartment. Our list of long flight essentials covers what's worth packing.

5. Add a tracker. If your bag gets gate-checked or left at security, a Tracker Card shows you where it is on Apple Find My or Google Find Hub.

For more packing tricks, see how to fold clothes for travel.

TLDR

The best personal item backpack fits your airline's under-seat limit, opens like a suitcase and keeps your laptop and documents easy to reach. The GRID Backpack Pro is our pick for one-bag travel: 26L within the 45 x 35 x 20 cm limit, expandable to 31L when you need a carry-on. For a slimmer everyday bag, go for the 21L GRID Backpack.

One bag. No bag fees. No compromises.

SHOP TRAVEL BAGS →

FAQs

What size backpack counts as a personal item?
It depends on the airline. Many US airlines, including American and Spirit, allow 18 x 14 x 8 in (45 x 35 x 20 cm). United and JetBlue allow 17 in, and Ryanair 40 x 30 x 20 cm.

Can a backpack be a personal item?
Yes, as long as it fits your airline's personal item limit and goes under the seat in front of you.

What is the best personal item backpack?
For one-bag travel, the GRID Backpack Pro. It's 26L, fits the 45 x 35 x 20 cm limit unexpanded, opens 180° and expands to 31L when you need more room.

How many liters is a personal item backpack?
Most personal item backpacks are around 20–30L. Bigger than that, and they usually go over the size limit.

Can I use an expandable backpack as a personal item?
Yes, as long as you keep it unexpanded. Once expanded, it's usually too deep to count as a personal item, so treat it as a carry-on.