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3 Expandable Backpacks Compared: Which One is Best for You?
Expandable backpacks are a game-changer for travelers. Whether you need extra room for shedding layers as the weather warmer or want space for souvenirs on the way home without overpacking on the way there, these bags ensure you’ll always have the space you need.
Backpacks expand in three main ways: by increasing the main compartment, expanding an additional compartment, or using a rolltop. While I prefer expanding the main compartment, each style has its pros and cons.
In this post, I’ll explore each type of expandable backpack by looking at a specific backpacks. I’ll break down their benefits and drawbacks to help you choose the right one for you.
Comparison of the Expandable Backpacks
| Osprey Daylite | Knack Pack | 8000Kicks | |
| Capacity | 26L expands to 32L | 24L expands to 35L | 18L expands to 30L |
| Size unexpanded | 43 x 33 x 16 cm 17″ x 12″ x 6″ | 48.3 x 30.5 x 11.4cm 19″ x 12″ x 4.5″ | 46 x 30 x 13 cm 18.1″ x 11.8″ x 5.12″ |
| Size expanded | 43 x 33 x 20 cm 17″ x 12″ x 7.87″ | 48.3 x 30.5 x 22.9cm 19″ x 12″ x 9″ | 63 x 30 x 13 cm 24.8″ x 11.8″ x 5.12″ |
| Weight | 0.84 kg (1.85 lbs) | 1.36 kg (3 lbs) | 1.05 kg (2.31 lbs) |
| How to expand | Main compartment gets expanded with zipper | Separate compartment gets expanded with zipper | Simply adjust the roll-top |
| Special feature | Super lightweight | Lots of organisation compartments | Eco-friendly hemp material |
| Check Price & Availability | Check Price & Availability | Check Price & Availability |
Expandable Big Compartment Backpack: Osprey Daylite (26+6L)
The Osprey Daylite Expandable 26+6L Backpack expands by increasing the size of its main compartment, adding 6L of extra space. This design allows you to fully utilize the available space without creating awkward extra compartments.
The main compartment becomes quite large when expanded, so I recommend using packing cubes to stay organized.
The laptop sleeve is located inside the main compartment. However, it remains accessible even when the bag is fully packed through a special zipper at the very back of the backpack.
Check out my full review of the Osprey Daylite Expandable 26+6L Backpack here for more details on its features and functionality.
✅ Expands from 26L to 32L
✅ Expands the main compartment for efficient use of extra space
✅ Large expansion allows plenty of room for bulkier items
✅ Lightweight at just 0.84 kg (1.85 lbs)
✅ Made with recycled, durable materials that are PFAS-free
❌ Without packing cubes, items can feel disorganized in the main compartment.
❌ Minimal padding, so it’s not ideal for heavy loads or long hikes.
❌ Often sold out due to its popularity
Expandable Multi-Compartment Backpack: Knack Pack Series 2 (24+11L)
The Knack Pack Series 2 Medium expands from 24L to 35L. The expandable compartment is separate from the unexpanded bag’s main compartment and opens up like a suitcase. When unexpanded, this suitcase-style compartment is very thin and doesn’t hold much.
The bag’s many compartments are great for organization, but there’s a tradeoff, filling one pocket often takes away space from another.
There’s a separate laptop compartment at the back, if that’s important to you then this is the best expandable laptop backpack.
Check out my full review of the Knack Pack Series 2 Medium here for an in-depth look at its features and functionality.
✅ Expands from 24L to 35L
✅ Expandable compartment has a a suitcase-style opening
✅ Multiple compartments provide excellent organization options
✅ Separate laptop compartment for quick access
✅ Can be used as a duffle bag with hidden shoulder straps
❌ Suitcase-style compartment is too thin to be useful when the bag is unexpanded
❌ Filling one compartment reduces space in others
❌ Weighs 1.36 kg (3 lbs), slightly heavier than other options
❌ Hidden water bottle pocket takes away space from the main compartment
Expandable Roll-Top Backpack: 8000Kicks Everyday Backpack (18+12L)
The 8000Kicks Roll-Top Backpack expands from 18L to 30L, simply adjust the roll-top depending on how much space you need. Roll it down for a compact fit or leave it open and secure it with the zipper for maximum capacity. This makes it very easy for adjusting on the go.
It’s made from waterproof hemp, which is great for sustainability and durability, but it also makes the bag feel a bit heavier compared to other backpacks.
The padded laptop sleeve is easy to access when the bag isn’t full but when the backpack is packed to capacity it gets more challenging pulling the laptop out.
Check out my full review of the 8000Kicks Roll-Top Backpack here for more details!
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✅ Expandable from 18L to 30L
✅ Roll-top design provides a secure and weatherproof closure
✅ 100% hemp fabric, durable, sustainable, and water-resistant
✅ Anti-theft pocket keeps valuables safe from pickpockets
✅ Embedded USB plug for charging devices on the go
❌ Hemp material adds some extra weight compared to synthetic fabrics
❌ Minimal internal organization compared to other backpacks
❌ The more you pack, the harder it is to reach items at the bottom
Final Thoughts: Best Expandable Backpacks for Travel
Expandable backpacks offer flexibility, whether it’s making room for extra layers, packing for changing seasons, or squeezing in souvenirs without overpacking from the start. Each expansion style has its advantages, and the right choice depends on what you prioritize.
- If you want a simple, spacious expansion, the Osprey Daylite Expandable is a great choice, adding extra space directly to the main compartment.
- If organization and a structure are important, the Knack Pack Series 2 is a fantastic option.
- If you prefer a eco-friendly design with a flexible roll-top closure, the 8000Kicks Backpack might be perfect for you.
No matter which style suits you best, an expandable carry-on backpack can make travel easier and more adaptable.
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