Haven't tried it outdoors yet. Very lightweight, and quite big in storage size, more than I expected. I am 1.70m and when using the mat as back it comes up pretty high up the shoulders, much higher than depicted on the pictures. It is still comfortable. The belt packets are great size, and the outer mesh looks very handy. Some of the buckles are extremely small, I hope they will survive constant use. Overall seems like an excellent bag for trekking.
The strap from the big outer mesh pocket is gone after one strong compression. Ripped at the sewing. Hope the rest stays intact longer because it is an awesome bag for the money. Done a 4h hike with 10kg, packed to max volume and it handled it very well.