Our 30L travel backpacks are designed for those who need just the right amount of space for short to medium trips. With a focus on comfort and durability, these backpacks are your go-to for quick getaways and everyday adventures. Our Series 1 and Series 2 medium-sized expandable backpacks offer patented packing function and flexibility. The Series 1 Medium offers 27 liters of capacity when unexpanded and up to 39 liters when expanded. Similarly, the Series 2 Medium can store 24 liters when unexpanded and up to 35 liters when expanded.

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The Best 30L Travel Backpacks

We designed the best 30L travel backpacks for One Bag Living. Perfect for work and leisure, Knack backpacks feature a patented, separate expandable travel compartment so you can easily pack multiple outfits. Ensure your tech and accessories are safe and organized with our padded laptop compartment and organization pockets. These carry-on backpacks with professional-looking, water-resistant fabric keep your gear dry and within reach, making them great travel backpacks for men and women. Stress less and enjoy more by shopping Knack’s 30L travel backpacks.

30L Backpack Features

  • Expand Your Horizons

    Separate, patented, expandable suitcase compartment makes packing for travel easy by giving you 45% more carrying capacity. Easily access 2 to 3 changes of clothes with a convenient suitcase lid.

  • Stay Organized

    Keep all your gear secure and easy to find with next-level organization, including everything from fleece and mesh accessory pockets to a hidden side-zip water bottle pocket and a padded laptop pocket.

  • Travel Set for Two Backpack Knack

    Be Compatible

    To make your travels easier, our hidden trolley sleeve lets you slip your Knack over the handle of almost all sizes of wheeled luggage.
Travel Knack Backpacks

About Knack

Knack sprang from the simple observation that too many people were carrying too many bags at the same time. This aha moment spurred our passion to live a One Bag Life. So we pulled together a dedicated group of frequent travelers and bag enthusiasts––from Tumi, Coach, North Face, Samsonite, and eBags––to create the one bag that’s clever enough to replace two.

30L Travel Backpacks FAQs

What can I fit in the Knack 30L Backpack?

The 30L Knack Pack holds a 15” laptop, daily essentials, tech accessories, and—thanks to the patented expandable compartment—clothing for 2–3 days, making it perfect for work, gym, and travel.
Is the 30L Knack Pack carry-on approved?

Yes! Even when expanded, the 30L Knack fits within most domestic and international carry-on size requirements, so you can skip checked baggage and travel lighter.
Are the 30 liter Knack Packs water-resistant and durable enough for daily use?

Absolutely. The Knack Pack is made from high-quality, water-resistant fabric with an antimicrobial lining. It’s engineered to handle daily commutes, business trips, and weekend getaways while still looking polished.
How is the 30L different from other Knack bag sizes?

The 30L Knack Pack is our mid-size option—large enough for multi-day travel but still compact for everyday carry. It offers the same laptop protection, organization features, and expandable design as other Knack sizes, but with the ideal balance of space and portability.

Testimonials

There is quite literally nothing I don't love about this bag. I almost went with the Large size because I traveled a lot more in my previous role. But you can get a surprising amount of stuff in the Medium. A smart packer can do a 3-day trip with just this backpack. If you're like me and you've looked and looked and thought and thought about this bag, stop looking, stop thinking, ADD TO CART, and get a bag that will not disappoint. Then sit back and plan to explain the bag to people because you'll get compliments and questions all the time.

Michael D

I got this Knackpack when I started my MBA at the Wharton School. I didn't realize what a cool pack it was until I started using it. After a year of traveling across the country for work and class, it still looks brand new. It has been rained on, thrown under airline seats, and stepped on in the classroom. I literally carry it every day, but you'd never know. It holds its form well, protects all my stuff, and has the perfect amount of space to pack for a workday (when not expanded) or a three or four day weekend (when expanded). The backpack that is changing the backpack. Great job, Knack!

Garry

As a flight attendant I am aleays looking for sustainable and practical packing solutions. This bag is exceptionally practical and convenient. Initially, I had concerns about its size, but it has proven to be ideal. It comfortably fits on top of my carry-on and is secured to the handle using the convenient slit on the back of the bag, ensuring that all my documents and devices remain within easy reach. I highly recommend this bag to flight crew

Jorge

The expandable main compartment is a game-changer—when zipped out, it easily holds enough clothes for a 3-4 night trip. I packed it for my current trip and was surprised by how much it fit without feeling bulky or overstuffed, and it fit under the plane seat.

Ryan

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