The Problems

With respect to backpacks, every hiker faces the issues of base weight, capacity, and comfort. Many thru-hikers discover that as they lose weight their pack stops fitting correctly.


1)  Weight.  To keep base weight low, only consider packs that are 3lbs or less. This disqualifies external frame packs and military rucksacks.


2)  Capacity.  To carry everything necessary for a thru-hike, including a week’s worth of food, the sweet spot for backpack capacity is 3500 – 4200 cubic inches (57–65 liters). We strongly discourage you from buying a pack outside this range. Smaller packs are certainly lighter, but do not have the suspension necessary to comfortably carry heavy loads, like when you resupply and leave town with a week’s worth of food. Plus, their smaller capacity tempts people to leave out essentials. Bigger packs certainly have excellent suspension systems, but they are much heavier (5-8 pounds) and their greater capacity tempts people to bring extra stuff they don’t need, increasing base weight even further.


3)  Suspension and Support.  In order to properly transfer the weight of the pack to your hips, rather than have it all rest on your shoulders, the pack needs to be supported by a frame. Frameless packs simply are not comfortable for long periods of time without having an extremely  low pack weight. After considering the wide seasonal and temperature fluctuations on an AT thru-hike, the need for a fully-enclosed shelter, and an average of one week between resupply points, we’ve concluded that pack weights below ten pounds cannot be achieved on a AT thru-hike without sacrificing safety.

Must Haves

less than 3 lbs

57–65 liter capacity,

(aka 3500–4200 cubic in.)


replaceable hip belt


won’t absorb water

dries quickly if wet



Would Be Nice

low price

keeps your back dry

adjustable torso length

adjustable shoulder width

totally waterproof


Not Important


wide opening for bear cans

lots of zippered pouches


What’s Out

military rucksacks

external frame packs

frameless packs

4)  Comfort & Fit.  Nothing is more important than your pack’s fit, even weight. The more adjustable a pack, the better the fit. The ability to change the pack’s torso length and shoulder width by adjusting the shoulder straps is crucial to a properly fitting pack. In order to reduce weight, manufacturers sometimes eliminate these features, making the shoulder straps fixed. We recommend avoiding these packs unless you can visit an outfitter in person and ensure the pack fits you comfortably.


5)  Shrinking Waist Line.  Thru-hikers can lose a lot of weight during their trek, which causes their pack to stop fitting correctly. Rather than torso length and shoulder width, the issue is hip size. The ability to swap out the hip belt for a small size is important. Frameless packs rarely have interchangeable hip belts, another strike against them.


6)  Moisture and Heat.  Backpacks need to be made from materials that won’t absorb water and dry quickly when wet from rain. This disqualifies military rucksacks, which are made from cotton. As you hike, your back sweats. Any properly fitted and balanced pack should ensure some air circulates between the pack and your back, but certain designs allow more air flow than others.


7)  Durability.  If you go bushwhacking and tear the pack on thorny bramble, that’s on you. But otherwise a pack should last the entire thru-hike and beyond without a seam tearing, a strap breaking, or a zipper malfunctioning. This means simpler is better—the fewer zippers, clasps, compartments, and do-dads on the pack, the less chances of something tearing or breaking. 

Recommended Backpacks

Granite Gear Crown V.C. 60

Weight: 2 lbs 2 oz
Capacity: 3660 ci  (60 liters)
Price: $200


The follow-up to Granite Gear’s popular Vapor Trail, the Crown VC 60 is one of the most popular backpacks for thru-hikers and it’s our top pick. It has everything a thru-hiker is looking for: low cost, exceptional weight to capacity ratio, back ventilation with air channels, fully adjustable torso, interchangeable hip belts, excellent compression system, comfort, durability, and quality.


Plus, it’s female friendly: all Granite Gear packs come in an alternate “Ki” version designed for women, with hip belts and shoulder straps designed for a woman’s figure.


It’s perfect for the PCT as well since the top opening is wide enough for a bear canister and there are ice axe loops. The pack will last years—possibly a lifetime. Our founder and managing editor used the same Granite Gear Nimbus Ozone (an older discontinued model) on his AT, PCT, and FT thru-hikes and not a single stitching has come out, nor has the material torn. After a decade of intense use it’s still completely solid.


Surprisingly, it is the least expensive pack meeting our criteria, making it the best value. Plus, because it is also the only ultralight pack available at REI and other big retailers, you can try it on in the store and get it for an even lower price during a seasonal sale or with a member’s only discount. 

Ultralight Adventure Equipment Circuit

weight:  2 lbs 9oz

capacity:  4,200 ci / 68 liters

(2400ci in main compartment, rest in exterior pouches) 

price:  $235


The ULA Circuit is also one of the most popular backpacks for thru-hikers, along with ULA’s CatalystOHM and CDT. We love it because of its weight to capacity ratio, interchangeable hip belts, comfort, external storage for wet gear, durability, and quality.


Plus, it’s female friendly, with shoulder strap options to fit a woman’s figure and multiple hip belt sizes for a custom fit.


If you plan to hike the PCT after the Florida Trail and are looking to use the same pack for both treks, then we recommend going with the ULA Catalyst, which is better for holding a bear can and more comfortable when carrying the heavy loads of water necessary in the desert. 


ULA was founded by a PCT thru-hiker and for many years was based out of his garage. All ULA packs are made in the USA and cost the same or less than packs mass-produced overseas. They have a reputation for strong customer service and will work with you to get the right fit, which is crucial since ULA packs aren’t found in many stores and so you’ll probably have to buy one online. 

Runners Up

Rain Protection

Pack Fitting 101

image via REI
image via REI

Don’t assume you need a “long” or “tall” pack just because you are tall. When buying online, look at the manufacturer’s sizing chart to determine which options best fit your torso length and hip size. To do this you will first need to measure your torso from your C7 vertebrate to your pelvic girdle


  • the C7 vertebrate is the highest vertebrate that sticks out when you tilt your head down
  • find your pelvic girdle by putting your hands on your hip bones with your thumbs pointing toward the middle of your back – the line between your thumbs is the pelvic girdle  

Ditch the Top Lid

We added "top lid" to our list of disappointments above, and this may surprise some readers. Internal frame backpack designs from 20-30 years all sport a zippered lid pocket. People like to stash small items like sunglasses, sunblock, bug spray, snacks, and rain gear in them, but the lid adds a significant amount of weight with only trivial convenience benefits. The lid also leads to a smaller main compartment opening, which makes fitting a bear canister harder. Finally, lids make it difficult to use the compression system to expand or shrink the pack’s capacity. For all these reasons, most lightweight backpacks have ditched the lid in favor of a simple roll-top closure, and we recommend avoiding packs with lids.