The streamlined Muon 50 pack from Rab is designed for fast-moving hikers covering long distances with lighter gear, featuring ultralight Spectra Ripstop fabric and a close-fitting Tri-Flex carry system for all-day comfort. This tough pack can be stripped of its lid to shed weight, making it perfect for those who need to adapt quickly to changing conditions. Ideal for long hikes, it offers excellent stability and comfort with a shaped lumbar pad and supportive hipbelt.
100D High Tenacity Nylon with Spectra Ripstop for durability and lightweight performance
Tri-Flex Carry System for light and stable support with wrap-around harness construction
Shaped Lumbar Pad and Supportive Hipbelt for comfort on long days
Forward Pull Hipbelt for easy adjustment and stability
Removable Lid with internal and external pockets for versatile storage
Drawstring Closure allows the pack to expand and compress as needed
Top Compression Strap helps stabilize the load
Two Harness Pockets and Two Large Side Stash Pockets for on-the-go storage
Large Front Stash for quick-access extra storage
Ultralight Compression with lower straps ideal for carrying extra equipment
Collapsible and Z Folding Pole Carry Compatible for convenience
3 Litre H2O Bladder Sleeve with dual exit option for hydration
Weight 995 g
Dimensions
Back length: 48 cm
Materials
75% nylon, 25% Polyester
The approximate size of the packed product or the sales package is 390 x 110 x 600 mm.
Light but solid, functional backpack. Very confortable even fully loaded. Volume seems biger than 50 L
Lenni H.verified buyer, 16.5.2026
Overall rating
☆☆☆☆☆
— Show original
An incredibly good backpack.
Emanuele C.verified buyer, 13.10.2025
Overall rating
☆☆☆☆☆
— Show original
Its lightness is its strong point. Comfort and practicality follow closely behind.
Because of its weight, you don't sacrifice anything in terms of organization.
It lacks back ventilation, and the side pockets are a bit loose.
It remains an excellent product.
Anonymousverified buyer, 12.10.2025
Overall rating
☆☆☆☆☆
— Show original
Very good bag. I've been hiking with it for a week so far, and I haven't had any problems.
The bag is lightweight yet comfortable.
Anonymousverified buyer, 13.2.2025
Overall rating
☆☆☆☆☆
The main reason why I bought this backpack is it has a detachable lid and when removed the main pack falls within the 55cm max for carrying onto aircrafts and storing in the overhead bins on European flights and the lid is also within the size that's allowed under the seat so I do not have to check my winter thru hiking backpack into the hold as I have had a pack destroyed before on the conveyor belt when there was no wrapping facilities at the airport.
Even with my tent, winter sleeping bag and 3 days food there is still lots of room left inside, the front mesh pocket has good stretch to store all my rain gear and the side mesh pockets have good stretch also perhaps too good as larger items have a habit of falling out as it is not possible to lash everything down with the little tension cord inside the pocket. But because the pack has ample anchor points for adding additional bungy cords this has resolved this issue ( see photos)
Overall the pack is comfortable when carrying 13kg but I have still not really got use to the trail running sternum design as I find it combursum in comparison to the traditional sternum strap. My biggest complaint is the pack squeaks when loaded above 8kg no matter how I load it , I know I will get used to it and perhaps it's just a fault in my pack and not all of them. I do miss not having hip belt pockets for keeping stuff in I want easy access to but I wear a Hip/Bum/Fanny pack with it that helps and the two shoulder strap pockets are good. Because of the hip belt design it is not possible to add any pockets on the hip belt.
Although I have not used the pack yet during a heavy rain days I think there may be an issue with water pooling inside the side mesh pockets where the mesh is attached to the same type of material as the main pack that joins onto the hip belt the design gives it the wrap around the hip comfortable feeling but I can see rain water pooling there, I will have to wait and see, but I would have liked to see drainage holes in the outside pockets.