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What size backpack should I choose?

There are a number of factors that influence what backpack is best for you. So let’s answer the above question with…three more questions. What activities are you going to do? What weather conditions are you going to do them in? And how long are you going for?

Once you’ve figured out your specific needs, we can figure out the best size for you. Here’s my rough guide to get you on your way.

35L and less:

Backpacks up to 35L are ideal day packs for both hiking and travel.


Opt towards a smaller hiking backpack for short day trips and/or lighter gear. Otherwise, consider one closer to the 35L limit if you need more room. That includes people who like to dabble in a picnic lunch, carry a bit of camera gear, or like to hike no matter the weather.

A pack with a bit more space means you can store additional clothing layers and include an emergency raincoat in case the weather turns. Never a bad idea.


A small, zipped day pack is a must for travel. Besides keeping your valuables secure, you can bring everything you need for a day out — like extra layers and a water bottle.

A small backpack is also convenient carry-on luggage. The wheels and handles on a traditional carry-on suitcase can add additional weight and blow out the luggage dimensions set by your airline. A backpack will help save on weight, space, and is extra packable in the overhead lockers.

That said, don’t get caught out. Make sure you check the required dimension of the airlines you fly with.

Autumn day packs 12
The Katabatic hiking pack is just 28L


Backpacks between 35L–50L are ideal for overnight hikes, lightweight hikers and travellers.


If you want to overnight hike (or a quick weekend adventure) you’ll need a backpack big enough to see you through the night. Keep it simple with the necessities: enough clothes for the next day, any food and water, sleeping gear and your tent.

If you want to embrace the ‘packing light’ philosophy on multi-day hikes, this size will still work for you. You’ll need specific kit to make this work properly — like a lightweight tent, lightweight sleeping mats, and packable, lightweight cooking gear — just to name a few.

But don’t be light only for the sake of it. If the conditions are cool, and/or you need gear that will ultimately take up more volume, consider scaling up. I’m a big fan of packing light, but it won’t outweigh the need for comfort, warmth, and safety.

Similarly, the longer you’re away, the more volume you’ll need, especially when it comes to food. Food and water can take up a significant amount of your pack if you’re hiking for more than a few days. You’ll need enough to adequately fuel your body each day, plus at least a day extra in case of emergency.

Arguably, this size backpack could be appropriate for a five-day trip if there are at least two of you rocking a 50L pack each with all the necessary gear and have rationed enough food and water for the journey. If you’re not that confident you do, then it’s straight to 50L and above for you.

Backpacking Voltai
The Voltai 40L pack takes on Japan.


Again, this is going to depend heavily on the actual gear going in your pack.

This size can be enough for minimalist packers. A smaller bag means you’ll be forced to pack less and follow the philosophy of packing what you actually need – not a bad habit to get into.

But if you’re going to snow season in Japan for two weeks, won’t have time to wash, and want to pack your big fat ski jacket, you may have to opt for a bigger pack. But if you’re about to spend a week in Bali with little more than a cocktail and a sarong, then this will suit you just fine.

50L and up

Backpacks bigger than 50L are great for longer multi day hikes and long-term travel, or a combination of the two.


If you want to embark on a multi-day journey where you’ll be carrying kit like shelter, sleeping gear, clothing for different conditions and all your food, a 50L + bag is probably the best backpack for you.

You might be tempted to get rid of a few items that are hogging all the volume — but don’t take too much out on your sleeping gear. A good night’s rest is essential, especially when you’re putting away serious kilometres every day. At a minimum you should have a warm enough sleeping bag, a sleeping mattress, and some garments to whip up a pillow (fleece, down jacket, anything soft really).

Instead, cut out unnecessary clothing, look for packable, lightweight gear, and choose an appropriately sized backpack that can accommodate all the hiking necessities out on the trail.


A 50L+ backpack is a great friend to those backpacking around Europe for a few months or through countries with rapidly changing weather conditions. These bags are spacious and can accommodate a number of outfit changes before you ever have to visit a laundromat.

They’re also ideal for a combination of hike and travel, as long as you’re following the philosophy above. Think the Camino de Santiago, the Pacific Crest Trail or the Great Ocean Walk.

Note: as a rule of thumb, don’t carry more than you really have to — less is always more (or as Miss Piggy used to say, “Never eat more than you can lift”). Remember that comfort is key. The best choice you can make is a backpack that’s good for your back. The fit of the pack, should outweigh the size of pack.

Backpacking Europe V2
The 65L Entrada backpack comes with a detachable 15L daypack.

Choosing the right size backpack is highly personal. So before you commit, consider the activities, the weather conditions and duration of your trip — don’t skimp out on the necessities, and buy lightweight, packable gear to make your journey even better.

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