Very good product with some limitations 1

It is now over a year since I use this backpack. Solid and practical, aesthetically pleasing while remaining discreet, all for a price quite affordable. And yet, use some improvements seem necessary:

1: a ventilation system for the back. In summer, the size and weight of the bag will make you sweat like a Hawaiian sumo wrestler.
2: the lack of space is quickly revealed if only one is carrying several lenses. Mine is already filled with only a Pentax K10D and two Sigma 18-50mm & 60-250mm lenses Pentax. More space in the two compartments would not be superfluous. There is indeed a Speed ​​Pack 85 largest, but honestly who needs space for laptop?
3: a strap to the waist to hold the bag in place when hiking.
4th: fixing a side (in addition to those found below) to hang a monopod (or something else.)

When I received this bag, I would have easily given it 5 stars. But after more than a year of use, these limitations, especially the first two, do I limit my review to 4 stars.