I commute on a motorcycle. In the summer time. In Phoenix, Az. Needless to say, I had gotten used to showing up wherever I was going (work, home) with my back absolutely soaked. I thought there had to be something like this out there, or a backpack that incorporated it. I was so excited when I found this, but a little skeptical of how it might work. I am happy to report that it works VERY well, and I am so happy I found it! It is very sturdy, yet also extremely light. It stays in place well (I was a little skeptical about that) and can be adjusted easily to increase space between your back and the bag. Overall, this was a great purchase, and is a must-have for anyone SICK of having a sweaty back all the time. Highly recommend!

I have been looking for this product for ages - everywhere in the whole entire world but couldn't find it - until when I by accident found it here on Amazon (the US site)! That was the BEST decision of my life!

VentaPak is just so unique and functional that it is worth every single dollar you are paying for this product! Remember that you have only one back and you don't want to destroy your back with bad posture cause fixing your back when it is already broken is super difficult to cure, that it's actually better to prevent it from happening from the first place.

And who wants to walk around with sweaty sticky back on the same time? Noone!

Does this product live up to the hype? Hell yeah, it definitely does! On the contrary, I'm actually positively shocked over the result. Even had to order it from other side of the world with customs and import etc... but still worth it. Wish that this product is coming to Europe. Maybe eventually?

The whole entire frame is that sturdy and stable that it could even handle my HUUGE back with full of loads without any problems. Not even a single bend or any breakage at all. This thing is made to sustain huge amount of load, I'm sure I can use this for years without a hiccup.

Is it comfortable to use? Oh yes! It feels so much better to use this one than without, that much I can tell you! The shape and forms were perfect and it fits all the rucksacks I have tried so far.

I paired with all from street rucksacks to hiking rucksacks to hydration packs, everything fits due to the simplicity of the attachment device.

Is it lightweight? Very much!

Any cons so far? Well, unless you need to fold your rucksacks to save space, then I don't see any reasons why you shouldn't buy this ventilation and good-posture-for-your-back product!

I just wish I knew about this product earlier or it was produced earlier cause so many years I have been suffering with both bad back posture and sweaty backs that much that I sometimes hated to wear rucksacks altogether but this VentPak product is a GAME CHANGER! That's for sure!

And another very positive thing about this product is that the seller and producer to this one was very keen on helping me with answering questions and giving me advice, assisting etc. Seems like they really care about this product and how to develop it to become better and better. That is something I very rarely see in other companies. So thumbs up for this great service!

In conclusion, TL;DR: A must buy product and totally recommended! That good product that I actually want to buy one more extra for my fiancee as well.

This works exactly as advertised and keeps your back much dryer while hiking. I'm knocking a glass star because if you're smaller and pull it up on your back, the cage hurts because it digs in some.

I purchased this to add some ventilation to my 60L backpack. Not only did it add ventilation, but the curve fit my back well encouraging better posture and less back strain.

One the negative side, it's a bit heavy and awkward to attach. I haven't used it heavily, but am already seeing signs of wear. I expect I'll have to replace it a few times over the life of my pack.

For reference, I've used this on a 60L pack weighing 16-25 lbs, mid torso size.

Great quality, let air between my back and backpack. Great fit