I like the GoLite JAM 35 Liter...I got it for 100 bucks. It's pretty durable from what I've heard and read and holds all of my stuff. I'll get back to you once I start using it frequently to confirm durability. It holds up to 30 lbs. It weighs a little over a pound, you'd need a waterproof pack cover, but it may be what you're looking for. If you are a small guy like me though they may not have your size in stock. I think Medium and Large are available on the GoLite.com website and I saw a few packs on eBay.