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Mountain Hardwear
UL 20L Backpack

4.342105263157895 out of 5 stars
38 Reviews


Size Chart


Why We Like The UL 20L Backpack

Long-distance summits feel a bit easier to reach with the lightweight UL 20 on your side, thanks to its ultra-light design, lofty cargo space, and durable construction. This pack is ready for it all, and is packable for easy storage when you’re done.


  • A superlight backcountry pack for big days on the trail
  • Lightweight design packs down small and stows in pocket
  • Durable, recycled 210D ripstop nylon holds up to abrasion
  • Modular, removable center strap offers weather resistance
  • Center strap compresses load and secures extra gear
  • Breathable air mesh shoulder straps help keep you cool
  • Stretchy side pocket stores your bottle and keeps it close at hand
  • Item #MHWZ994
Responsible Collection
200D recycled ripstop nylon
20L (1220cu in)
Shoulder Straps
air mesh, removable sternum
2 side bottle, 1 zippered front
Gear Loops
center strap
[torso] 16 - 22in
Claimed Weight
hiking, climbing
Manufacturer Warranty

Overall Rating

4.5 based on 38 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 2 reviews
3 Stars - 4 reviews
4 Stars - 7 reviews
5 Stars - 24 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

May 21, 2024

Great pack to bring along for travels!

I bought this pack to bring along with me during travels, to carry as I explore cities, or for nature day hikes. It is very light, yet large to hold shopping items, extra coat, rain gear, water, snacks. And it packs away into its own small pocket to throw in my luggage. It's perfect for what I need.

Ballard Viking

Originally reviewed on

5 out of 5 stars

May 11, 2024

Great Packable Backpack!

Great packable backpack. Perfect for traveling when you need extra space.

C. Brooks

Originally reviewed on

5 out of 5 stars

April 24, 2024

I live this super lightweight versatile pack!

The most versatily and useful pack! Packs down so small you can take it along anywhere, but fits plenty when you need it!


Originally reviewed on

5 out of 5 stars

March 31, 2024

Great travel pack

Perfect travel pack - I’m an airline pilot and it has served me well all over the country- I recently used it for a multiple day trip to Mexico City. Pyramids, balloon rides, museums - it was perfect

Guy V

Originally reviewed on

4 out of 5 stars

December 6, 2023

Great small pack. Fits 13 Inch MacBook

Love this little pack! It’s small but carries everything you’d need for a quick run out in the city or a short day hike. I do wish that it had some rigidity but that’s because I use it often enough that rolling it into itself isn’t how I’ll be using it. Fits a 13 inch Mac Pro in the pocket I believe is designed for a water pack. I like the open and close mechanism. Great little pack.

Tyler NYC

Originally reviewed on

3 out of 5 stars

November 5, 2023

Needs design work but well made

Love how light this backpack is and it’s comfy to wear with quite a bit of weight in it. Downside - front zipper pocket is too small and the outside open pocket is not designed to hold a water bottle as it’s too short and too wide. bottomline it’s a bit too minimalist. the larger version has three outside zipper pockets which is designed much better.


Originally reviewed on

4 out of 5 stars

October 3, 2023

Great daypack!

Love this daypack. Easy to use and very durable. I'm giving this a 4.5/5 stars because I wish there was a waist strap to alleviate some of the weight I carry from my back, but the chest strap helps. I also wish there was padding on the back side for more comfort.


Originally reviewed on

5 out of 5 stars

September 10, 2023

Light and Comfortable

This pack ticks all the boxes for me in a light summit pack and surprisingly works very well for a day of sport climbing. Super light and very comfortable. Designed with simplicity in mind, very few zippers pockets etc, but has what you need for most objectives.


Originally reviewed on

5 out of 5 stars

July 7, 2023

Great Light Day Hike Bag

Great bag that is light. I wanted a day pack that I could use on a day hike that wasn't my typical heavy bag with all the straps. This was a much better design.


Originally reviewed on

5 out of 5 stars

April 28, 2023

Great little daypack!

I'm very happy with this backpack! PROS: It is easily packable and lightweight, but feels much more substantial than other packable bags that are so thin that they always look crumpled and wrinkled. The outer zip pocket doubles as the pouch, and is the perfect depth for small items and also includes a key strap. There is no back support, but then again this is meant to be a stuffable/packable little daypack and it serves this purpose beautifully. The double handles make it easy to grab. The vertical center strap is removable, and helps to keep the backpack closed if it is stuffed full (flap over quick-draw opening). I got the light cactus green with the purple strap - love the colors! CONS: There is only one side pocket and it is really wide - good for larger items, but too large for my water bottle so I have to put it inside the pack. I'd like to suggest adding a (mesh?) water bottle holder on the other side, but this is not a deal breaker.


Originally reviewed on