The Deuter Aircontact X Backpack is an incredibly well-built and functional pack for heavy loads, and likely the best pack they have ever built. But it is itself very heavy and also very expensive.
Kelty Outskirt 50 Backpack
The Kelty Outskirt 50 Backpack is very light and reliable with its strong frame and exceptionally durable fabric, with a unique sternum strap design, and with an incredible price.