1
Even the 35+10 will not meet some airlines carry-on size restrictions. SOMEexamples here: http://www.luggagesource.com/Carry-on-size-charts.aspx Airlines also have weight restrictions and some do not allow more than 7kg (15.4 lbs). You would have to check-in either of the two packs you mention obviously.What size pack you need should be worked out backwards. That is, your sex, height and weight determine what weight you can reasonably expect to carry and what size pack (length primarily) should fit you. If I guess from your picture that you are 5' 2" and weight around 105 lbs. then you should not plan to carry more than 25% of your body weight which would mean around 25 lbs (11.36 kg)
First decide what you are taking. Get it down to under that weight and then pile it all up and determine how big a pack you need. Determine how many cu. in. or litres your stuff takes up. Now you know what size pack to look for. Now you can concentrate on finding the best fit, the next most important factor after weight.
When determing what you will take and therefore what size pack you will need, be ruthless and be smart. There are all kinds of things intended specifically for travel and that weigh less and have less bulk than 'normal' equivalents. For example, 'high performance' wicking t-shirts weigh less than the equivalent cotton t-shirt.
It is entirely possible for someone to travel the world with 5kg. in their pack. With a pack that itself weighs under 2kg. that makes them carry-on ready on any airline you can name. But you have to be ruthless in what you take and smart in which choices you make, to achieve that.
7
Actually I think you will be able to get it on as carry on IF you don't over pack it. I use a 45l climbing pack for trips to Europe, but usually it is only 2/3rds full. Just to clarify the Talon 44 is designed for lightweight trekking and long winter mountain days, rather than technical climbing.8
I agree if the pack is only going to be used for travelling. I guess the argument is a trekking pack is better for travelling than a travel pack for trekking so even if you only trek occasionally and can only afford one pack (or in my case just can't justify it) then a trekking pack is the way to go.9
I went 6 weeks in India with a 36L and it was actually to much for me. I wouldnt go back with a 36L and thinking of downsizing to a roughly a 30L.Go small, pack less, and youll have a darling of a trip.
10
See above re all the advice about travling light..I'm 6 foot 110 kilo and still refuse to leave home with more than 7 kilo in a back bag..
And that's travelling Singapore- China..
I just buy a cheap jacket and thermals when I get to the mountains and give them away when I get back to the tropics, and if I do accumulate stuff I post it to the GPO of my fly out city and pick it up there

