It really depends. If you are backpacking at a place that may have precipitation (rain), then mesh isn’t really a good option. I have a Gregory backpack that much better for that. If you’re really stuck on using mesh, then probably want to go with a set of small to medium packing cubes like Motodori has.
If the exterior of the backpack material is mesh, be careful not to snag it on a branch, they can rip, hence why I would recommend using cubes for inside the pack and use a good solid material interior frame pack by Gregory, REI, Kelty or Osprey.
My opinion is that you will sweat anyway so look out for something without mesh but some kind of air flow going.
My only backpack is this. I use it for everything, treks, travelling, hand-luggage and I take it always with me.
http://www.youtube.com/watch?v=-DyA9QjggFQ
It is actually better for packing as you say.
Those backpacks are very comfortable and they help to reduce the back sweating we all have experienced during long trips.
I think the choice depends greatly on the type of trip you are planning to take. If you are leaving for a, let’s say, three day trek where you don’t need much stuff with you, and you will likely have the backpack with you at all times, then that is the perfect choice for minimizing fatigue. If, instead, you are leaving for a month trip in, eg, middle east where you need much more space and you won’t likely have the backpack with you all day (because you can leave it in hostels, train etc) I would go for a normal and lighter one (not to mention that usual backpack are less likely to be stolen than a fancier one)
Credit:stackoverflow.com‘