Some questions on a Golite Jam 50L

the 2009 Jam that I have is heavier than my original Jam because:

1 it is greater capacity – say 50-55 litres as opposed to the original's 40-45 litres

2 it has a whole lot of 3D mesh padding down the back and on the hipbelt where the original did not

3 It has hipbelt pockets (and hipbelt is larger)

4 The stretch pockets are a heavier fabric than the original mesh

In many ways the newer has better design features and definitely more comfortable, but not as well made. Barring fire or loss, I expect the old one to last a lifetime, while the 2009 Jam is slowly coming apart on some seams.

I took my original on a 3 day backpack in the Welsh mountains last summer, (it was sunny!) and it was great with the lighter load I had then. I also prefer it for woodland camps/bivis as the 3D mesh on the newer pack attracts pine needles and suchlike – surprisingly fiddly to clean up.

ps
I don't think the weight has doubled?! My packs are both size L. Original= 650g approx, 2009 = 900g approx