Pack Smarter · Lighter · Confidently
Know What to Pack — and Whether It Fits
Most packing tools hand you a list and stop. PackFitter goes further: build a personalized list, see how small you can pack it, and check whether it fits your bag and your airline — all from real clothing volumes, not guesswork.
Three free tools. No signup, no ads.
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Check if my bag fits my airline →
Three tools, one system
Pack Smarter, Lighter & More Confidently
Packing comes down to three questions — what should I bring, how small can I pack it, and will it fit? PackFitter has a dedicated tool for each, all built on the same real-clothing-volume engine so their answers line up.
Not sure which to start with? Use the Packing List Generator to plan a trip, the Bag Size Calculator below to find your bag size, or the Airline Bag Size Checker to test a bag you already own.
More from PackFitter
Guides & References
Trip Packing Guides
What to pack for 3 to 14 days, Europe, cruises, and Alaska — with volume targets for each.
Browse guides →
Airline Carry-On Rules
Size and weight limits for Delta, United, American, Southwest, Ryanair, EasyJet, and more.
Compare airlines →
Bag Size Comparisons
See what 25L to 50L actually holds — and which sizes fit your airline's overhead bins.
Compare sizes →
Packing Optimization
How compression cubes, rolling, and smart layering can save 20–30% of your packing volume.
Learn more →
What do these bag sizes mean? (in liters)
- Under 25L — Small backpack / personal item range
- 30–40L — Medium to large backpack (common for travel)
- 40–45L — Typical carry-on size for most airlines
- 45–50L — Large carry-on (borderline for some airlines)
- 60L+ — Checked bag range
How It Works
Three Steps to a Smarter Packing Decision
1
Enter Your Trip
Trip length, climate, packing style, and any gear you need to bring.
2
Pick Your Bag & Airline
Choose your bag size and airline, then compare your setup against real packing volume and airline limits.
3
Get Your Result
See if it fits, what to adjust, and which bag size actually works for your trip.
Core Gear
Core Gear That Makes Carry-On Packing Easier
These three items solve the most common carry-on packing problems — before the calculator even matters.
Compression Packing Cubes
Reduce clothing volume by 20–30% before you even think about bag size. The single highest-impact packing upgrade for any trip length or destination.
Check price on Amazon →
Osprey Farpoint 40 — Carry-On Backpack
40L is the common carry-on ceiling for one-bag travel. Front-loading access, hip-belt support, and enough room for a week-long trip without checking a bag.
Check price on Amazon →
Osprey Daylite — Personal Item Daypack
A 13L under-seat daypack keeps tech, documents, and day-trip gear accessible without eating into your main bag. Doubles as an excursion pack at your destination.
Check price on Amazon →
We may earn a commission from purchases — disclosure
Why PackFitter
Built on Real Data, Not Guesswork
Most packing advice tells you to "roll your clothes" and hope for the best. PackFitter uses real clothing volumes, packing efficiency ratios, and airline-specific carry-on dimensions to give you an actual answer.
The calculator accounts for clothing size, packing style, compression potential, rigid items like laptops and shoes, and whether laundry access changes the equation. It's the difference between a guess and a plan.
This is a planning tool, not a guarantee. Airline staff make the final call — packed shape, bag rigidity, and gate-day enforcement all play a role.
Use Cases
Common Packing Questions This Tool Helps You Answer
Use it to answer real packing decisions before your trip.
Will this bag fit my trip?
Do I need a personal item too?
Is a 40L bag (typical carry-on size) enough for a 5-day trip?
Will this setup work on my airline?
How much do extra shoes affect space?
Will cold-weather gear push me to a checked bag?
Can I avoid checking a bag on this trip?
What bag size should I actually bring?
Start with your trip
Packing Guides by Trip Length & Destination
Start with your trip type or destination to get a tailored packing list.
Browse all packing guides →
Airline guides
Airline Carry-On & Backpack Fit Guides
Compare carry-on limits and see what size backpack actually fits for your airline.
See all airline carry-on rules →
Tools
Bag Size & Packing Tools
Understand bag sizes, airline rules, and how to maximize your space.
About PackFitter
How This Site Works
This site helps you pack smarter by combining trip length, airline rules, and real bag capacity. Instead of generic packing lists, everything is tailored to what actually fits in your bag.
With 50+ pages covering trip lengths, destinations, airline-specific fit guides, and packing tools, PackFitter gives you the specifics — not the usual "roll your clothes and hope for the best" advice.
Popular guides
Most Visited Guides
Notes
How Accurate Is This?
This tool reflects real-world packing conditions, not just theoretical bag sizes. Results are based on typical clothing volumes, packing efficiency, and common travel setups.
Airline size limits are published in inches and apply to the full external dimensions of the bag when packed. A bag that measures within range at home may not fit the same way at the gate if it's overfull or poorly organized.
This is a planning tool, not a guarantee. Airline staff make the final call — packed shape, bag rigidity, and gate-day enforcement all play a role.
Last updated: April 2026. PackFitter is an independent tool. It is not affiliated with any airline or bag brand. Airline policies may change — always verify with your airline before travel.
As an Amazon Associate I earn from qualifying purchases.
