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Lithium 20L Daypack

4.888888888888889 out of 5 stars
9 Reviews



Why We Like The Lithium 20L Daypack

Mammut's Lithium 20L Daypack helps us get out on the trail as much as possible. Sure sometimes we won't be able to hike, but wet weather will never be the reason. Mammut made this daypack with a rain cover to shield all our hiking gear from wet weather. We also like Mammut's original detailing with the phone pocket that folds out of the hip belt for quick-and-easy access to our phones when we see an animal trotting by.


  • Daypack designed for rain-or-shine hiking
  • 20L capacity appropriately sized for full days on the trail
  • Air channels in 3D foam offer extra ventilation
  • Detachable rain cover treated with PFC-free DWR
  • Carry system for trekking poles
  • Fold-out phone pocket on hip belt
  • Compression straps secure the load no matter how much is packed
  • Item #MAMU5G9
100% nylon, PFC-free DWR coating
20L (1220cu in)
Contact (3D EVA foam)
Shoulder Straps
padded, adjustable
Waist Belt
detachable, padded
Hydration Compatible
zippered front panel
1 zippered key, 1 zippered front, 2 mesh side
Trekking Pole Carry
Rain Cover
8.6 x 20.8 x 9.4in
Claimed Weight
1lb 10oz
Manufacturer Warranty
2 years

Overall Rating

5 based on 9 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 8 reviews

What do you think about this product?


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5 out of 5 stars

December 12, 2023

Great bag. Taken to South Africa, Mexico and is wonderful. Durable

I actually need another! Great bag can't say enough.

Originally reviewed on

5 out of 5 stars

November 22, 2023

Quality pack.

Exactly as advertised. Doesn't have too much going on, and it's great for a short day trip.

Christian P

Originally reviewed on

5 out of 5 stars

November 8, 2023

Best Day Hiking Pack I've owned

Love the fit. It's a little longer than most small day hiking packs, so the hip belt fits and functions like it's supposed to. I don't get the back sweat like other packs I've owned. I'm rough on packs, fighting through trees and shrubs and this pack has held up way better than any other I've used. Very durable shell. Straps and clips are heavy duty for this type of pack. I'm going to buy a few more just to have back ups.

Originally reviewed on

5 out of 5 stars

October 31, 2023

Great day pack

I've used it several times
Size Bought:
5' 7"

Brought this to Japan for a 4 day hike and it was perfect. Love the flexibility of being able to take off the waist belt (I put it in my suitcase to check and used the pack as my in-flight bag). Nice and light-weight. It's a "men's" pack but I am a female and it fits fine although the waist strap is the smallest it will adjust. Great pack in every way. Even has a whistle

Simone B
5 out of 5 stars

July 24, 2023

Very functional

Perfect for a day out. The pack is compact with enough pockets to organize small things but not so many that things get lost in it. The handle on top is steady and the straps are comfortable. My six year old used it on some hikes and it was the perfect size as far as capacity. The fit was a little large but it was made for adults so no surprise. My wife used it as a day pack at an amusement park and a day out with our son. She is not an outdoors person but loved this pack. Thought it was the perfect size. It fit a rain jacket, food, water, and a few odds and ends. I would defiantly recommend this.

Originally reviewed on

4 out of 5 stars

July 21, 2023

Everyday adventure pack

Plenty of room, very comfortable for short or long adventures with it! Decent organizational pockets inside and has a spot for a water bladder as well. Nice air flow when worn to prolong the inevitable sweaty back but it cools down nicely when there's a breeze. I'd recommend it for everything short of having to bring a laptop anywhere.

Originally reviewed on

5 out of 5 stars

June 25, 2023

Feature-packed day pack

I've taken this on several day hikes, and it fits the ticket for a capable day pack. I thought the fold-out phone pocket in the waistbelt was silly until I used it, but it turns out to be great for averting the sweaty phone-thigh conjunction I'd previously encountered on summer hikes. It's pretty light given its feature set, but it probably won't satisfy any ultralight purists. Edit: I've also used this for a fair bit of light ski touring and resort skiing - it easily holds skins, snacks, an insulated water bladder, and an extra layer.

Originally reviewed on

5 out of 5 stars

May 31, 2023

Love it!

Great for my commute to work on my bike with a surprising amount of space!

Addison C

Originally reviewed on

5 out of 5 stars

May 25, 2023

Great on the go bag

This is my go to bag for day hikes or city touring very versatile and extremely comfortable no matter where the day takes you. Love the hydration sleeve for longer days out.

Originally reviewed on