GoLite Jam2 2008

This rucksack is exceptionally light at 600g; 51 litre capacity; designed to comfortably carry up to 14kg; Dyneema fabric very durable; huge front pocket; side compression straps; wand pockets; drawcord closure. But no lid, so water could get into main compartment; back system can be very sweaty; care required when packing as back is not stiffened; a specialist sack.
Verdict
If saving weight is your priority this for you, but it has drawbacks.

First published in Trail magazine, October 2008