Best Backpacks For Thru-Hiking – (Advice From an Actual Thru-Hiker)

Finding the best backpacks for thru-hiking can be a difficult process with so many companies making great products. The specific requirements thru-hikers have for a backpack is what I’m addressing in this article. This is aimed at first-time thru-hikers or those looking to lower their weight on their next long hike.
thru hiking backpacks

3 of the best backpacks for thru-hiking – HMG Windrider, Gossamer Gear Gorilla and ULA Ohm 2.0

Although there are slightly different requirements for each trail, the advice given here is applicable to The Appalachian Trail, Pacific Crest Trail, and the Continental Divide Trail. Or any other similar long hike.

This is not about the lightest, smallest, super ultralight backpacks because in my experience these packs don’t work for MOST people on MOST thru-hikes. For fair-weather hikes where you have minimal gear, or if you’re a seasoned pro then sure.

I’m also not covering heavy, overbuilt packs you’ll find in the average outdoor gear stores. These aren’t the best option for thru-hiking (or much else).

BUT, if you’re looking for a backpack that can comfortably handle 6 days of food, gear for temperatures down to 10f/ -12c and will last for at least 3000 miles of trail time, then check out my advice and recommendations below.

All the backpacks in this article have actually been used whilst thru-hiking by me or one of my hiking partners.

Why I’m Not Talking About Packs From The “Big Name” Brands You’ll Find in Outdoor Stores

There are two reasons:

Too Heavy

Shopping for thru-hiking backpacks in your local gear store isn’t the best idea. Almost all the options they’ll offer will be well over my recommended max weight of 35 oz / 992g.

It’s not to say these are bad backpacks, they’re not. They are just too heavy for thru-hiking and give you a bunch of durability and extra features you simply do not need.

Light Ones Are Badly Designed

You may find “lightweight” and “ultralight” options offered from some of these big brands but I’d still be hesitant. These backpacks will be lighter than their heavy weight options but still often well over that weight recommendation.

Also, in my experience, the functionality and features of these packs from the big names pale in comparison to lightweight backpacks built by smaller, cottage companies. They just don’t seem as well thought out.

Why I’m Not Talking About Frameless, Hip-Belt Less Backpacks For Thru-Hiking

The progression to ultralight backpacking gear is great and I highly advocate it, BUT…

I’ve seen lots of thru-hikers on trail with tiny, frameless, hip belt-less packs that seem miserable. Here are a few things I’ve seen.


  • The pack is so small they have to cut corners and bring gear that may not always work on a thru-hike with varying conditions. A quilt that’s not quite warm enough, a shelter that works ok but not great in bad weather and small bear cans that definitely won’t hold five days worth of food. These are just some of the examples.


  • They have all the necessary gear but when packing out food for 4-6 days they can’t fit it all in the pack without it being a lumpy, uncomfortable mess. Then there’s a dry stretch where they need to carry four liters of water and the packs’ weight is all resting on their shoulder straps..

I’m not saying it can’t be done, but most people will be more comfortable with a slightly heavier backpack that handles gear for varying conditions as well as 4-6 days of food.

If your base weight is low enough then stay tuned for an upcoming article on frameless, hip belt less backpacks.

gossamer gear gorilla in the high sierra
Gossamer Gear Gorilla in the High Sierra

I’m Only Talking About Packs That I Have Either Personally Used or That Hiking Partners Have Successfully Used for 1000’s of Miles

With over 5000 miles under my belt and way too much geeky obsession over backpacking gear, I feel in a strong position to give advice on gear. In this article, I only want to recommend packs I have solid trail time with, or that a close hiking friend has used and abused, as in one case below.

I trust these packs for thru-hiking and you should too.

Thru Hiking Backpack Size – AKA Carrying Capacity

Thru hiking backpack size is one of the most important considerations when shopping around. The two main factors that influence a packs volume are:

The gear that will live in the pack all the time

This is essentially all the components that make up your base weight. When thru-hiking, it’s normal for conditions and temperatures to change throughout the hike. This change means you want to have gear with you that can work in the warmest temperatures you’ll be dealing with as well as the coldest temperatures. You may need your backpack to carry a bear can through certain sections. You may not need a tent for weeks but then be hit with daily storms.

The point is the pack needs to carry all of your gear comfortably.


How much food do you need to carry?

On certain sections of the Appalachian Trail, you can carry food with you for as little as two days as you hit towns regularly. On the Continental Divide Trail, we had to carry enough food for six days on multiple sections. Food is heavy and bulky.

With these two factors combined, we can estimate our thru-hiking backpack size requirements.

For a gear setup that covers a wide range of conditions/temperatures AND can carry up to six days of food (relatively) comfortably, you should look at a backpack in the range of 40 – 55 liters.

Much smaller than that and you may struggle to fit everything in, any bigger probably adds unnecessary weight.

Gear bought from outdoor stores will be much bulkier and heavier than the gear I recommend for a lightweight thru-hiking setup. It will probably not fit into a backpack that’s 40 liters with five days of food.

If that’s the case then you need to start looking at all of the rest of the gear you’ll be using. Check out this post for some of my recommended gear.

thru hiking base weight
Everything needs to fit plus however much food you need to carry


Ultralight and lightweight backpacks come in a range of different materials. The best materials are lightweight, water-resistant, and decently durable. I don’t have a strong favourite but here are some of the options and some of their positives and negatives.

Dyneema Composite Fabrics (formerly Cuben Fibre)

One of the lightest fabrics on the market that usually comes with a heavier price tag than other fabrics. It is often blended with other materials to increase abrasion resistance and manufacturers use Dyneema Composite Fabrics (DCF) in varying thicknesses. The fabric itself is waterproof.

In use, it is durable and works well. White coloring shows dirt quickly, thin DCF can be susceptible to abrasion.


rolltop closure
Dyneema Composite Fabric (DCF) is used for Hyperlite Mountain Gear backpacks
Ripstop Nylon

There are endless different types of ripstop nylon and it has been widely used in the outdoor industry for a long time. It’s known to be tough and relatively affordable and using the right weave and thickness makes for low weights. Ripstop Nylon is not waterproof but is often treated with a water resistant finish to make rain bead away.

Different types of Ripstop Nylon found below on the Gossamer Gear Backpacks and the ULA Ohm 2.0

In use, it is flexible and effective. Thinner ripstop nylon can be susceptible to abrasion.



Durability is derived from fabric choice. As a general rule of thumb, the lighter weight the material the less durable the backpack will be. For thru-hiking it’s ok to make a slight trade off for a less durable product that weighs less.

Heavier, beefier backpacks found at sporting goods stores use thicker materials that are usually unnecessarily heavy duty and thus weigh a lot more than the options laid out below.

The packs below will last at least an entire 2500+ mile thru-hike and usually much longer.

Features to Look For

Because the features of a great thru-hiking backpack are so few they need to be spot on or the pack doesn’t make the cut.


Solid Water Bottle Pockets – Each side should be big enough to hold two Smart Water bottles with some kind of elastic to stop them flapping around. They need to be easily accessible without taking the pack off.

Mesh Stuff Pocket – Not all mesh pockets are made equal. The mesh needs to be stretchy but not too stretchy, durable but not overbuilt and be sized to hold a good amount of stuff as well as a wet tent when necessary.

Shoulder Straps and Hip-belt – Comfort is key. Shoulder straps and hip belts need to suitably padded without being overkill. They should be of high quality and easily adjustable on the move. Weight transference to the hip-belt is key and having large functional hip belt pockets is a must.

Closure Method – A roll top closure that buckles at the sides is my personal preference but they all work.

large water bottle pockets
Good water bottle pockets are a must


Most backpacks come in multiple torso sizes and this is an important consideration. Measuring your torso size with a measuring tape and help from a friend will ensure you get a pack that’s sized correctly. Simply measure from your Iliac Crest to the C7 vertebrae and choose the correct size option from the manufacturer.

A similar process can be undertaken to ensure you get the right size hipbelt.

This video is helpful if you have never done this before.

Weight of the Backpack

The weight of a backpack for thru hiking is an important factor but its’ suitably for the task at hand should come first.

A backpack that meets all the requirements I’ve outlined in this article should weigh no more than 35oz / 992g and some weigh a good bit less.

The Best Backpacks For Thru-Hiking

All of the backpacks I recommend below match the criteria I’ve outlined above. So to keep this article concise I’ll provide the specs of each bag and my experiences with it. I’ll also mention my favourite features and things I don’t love.

I trust each one of them wholeheartedly for thru-hiking.

Gossamer Gear Gorilla

I’ve hiked well over 3000 miles with Gossamer Gears’ mid sized backpacks and they are my current go-to option.

The Gorilla has a capacity of 40 liters and a medium-sized pack with a medium hip-belt weighs 30.5 oz / 865 g. The pack costs 195 USD with a hipbelt costing an additional 45 USD. The removable/optional hip-belt makes it a great option for those experimenting with hip-belt less backpacks.

gossamer gear gorilla one of the best backpacks for thru-hiking
Gossamer Gear Gorilla Backpack

My favourite things about the Gossamer Gear Gorilla:

  • Excellent, spacious mesh pocket – fits a ton of gear and is well thought out
  • Removable foam back-panel/sit pad – comfortable whilst hiking and provides a warm, dry platform to sit on when you’re not hiking.
  • Shoulder straps and hip-belt are well padded and breathable

Things about the Gossamer Gear Gorilla I don’t love:

  • Water bottle pockets developed holes quicker than I’d have liked – This was during a 400 mile trip mostly off trail through the granite talus of the High Sierra which should be taken into consideration. ( I probably should have been using the Silverback instead)

ULA Ohm 2.0

I thru-hiked the 2189 mile Appalachian Trail in 2015 with my ULA Ohm 2.0. Despite being on the market for a long time it’s still a bomber option for thru-hiking.

The ULA Ohm 2.0 has a capacity of 63 liters (it feels more like 50) and a medium sized pack with a medium hip-belt weighs 30 oz / 851 g. The pack in its standard configuration costs 225 USD with the hipbelt included. When ordering you can customize the pack color, strap configuration, and even have it embroidered for a few dollars more.

ula ohm 2.0 backpack
ULA Ohm 2.0

My favourite things about the ULA Ohm 2.0:

  • Massive water bottle pockets – Big enough to carry my tent on one side and two smart water bottle pockets on the other
  • Tall, slim profile – As opposed to the GG Gorilla the Ohm 2.0 is taller and narrower which some will prefer
  • Load lifter straps – not 100% necessary but a nice addition that allows for more adjustment

Things about the ULA Ohm 2.0 I don’t love:

  • Back panel caused some chafing – this was in the humid hell of the Appalachian Trail after months of accumulated salt buildup.

Click here for an (old) review I wrote on the ULA Ohm 2.0

Hyperlite Mountain Gear Windrider 3400

My good friend and long time hiking partner Josh “Cheesebeard” Tippett has hiked over 6500 miles with HMG backpacks and I’ve gotten to see they are some of the best backpacks for thru-hiking. I’ve hiked a good amount of miles with the HMG Windrider 3400 and both of us agree it’s the best of HMGs’ packs.

The Windrider 3400 is a 55 liter backpack that feels cavernous. The pack is available in either 50 denier white fabric (lighter) or 150 denier black fabric (tougher). White costs 345 USD and the black 20 dollars more. A medium size pack in white with the fixed hip belt weighs 31.82 oz / 902g and the black weighs 34.82 oz / 987g.

one of the best thru-hiking packs the hmg windrider
HMG Windrider Backpack

My favourite things about the HMG Windrider:

  • Solid closure method – the Windrider uses my preferred closure method, a roll-top opening that buckles at the sides with a top compression strap
  • Mesh Pocket – The large open mesh pocket holds a ton of stuff and good visibility makes items quick to grab
  • Water resistance – The use of DCF means the Windrider is very water resistant. Although I waterproof all of my packs with a trash compactor bag this offers extra piece of mind

Things about the HMG Windrider I don’t love: 

  • Price

Click here for a review Cheesebeard wrote on the Hyperlite Mountain Gear Windrider 3400


Are there other great backpacks available that are suitable for thru-hiking? Yes, absolutely.

However, I really wanted to give solid advice and recommendations for packs that I’ve either used personally for thousands of miles or that I’ve seen in detail over long periods of time. The demands put on a backpack for thru-hiking are much more intense than the average backpack that goes out for a few weekend trips a year and so they deserve a little more analysis and research before making a purchase.

Hopefully this article has helped you figure out a pack that’s right for you.

Thanks as always for reading and if you want more articles like this sent straight to your inbox (and a copy of my free ultralight backpacking ebook) then enter your email address below. Cheers!


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