The positives are:
-a good face
-The detachable backpack to carry into practice walking tour.
-The overall strength of the assembly; due to the rigidity of the materials, the bags do not carry around in all directions.
-the straps are doing their job well and keep the saddlebags.
-The cover for rain or dust.
Negative poins are:
-the weight of vacuum bags; one would think that this indicates strong manufacturing materials, it is not.
-The fragility straps of the backpack.
-the fragile construction of the set: zips seem very fragile, plastic on the back of the bags was ripped at the seams of the straps leaving a hole. So I recommend to secure the straps located in the middle of the rear saddlebags.
In conclusion, I think that these are bags for light hiking on non bumpy roads and for relatively light loads.
For the most serious hiking on difficult road, it is better to look elsewhere.
Less than 30 euros, so do not expect a great product.