Take a look at Orvis Clearwater 6-piece or the Cabela's Clearwater Travel rods (also 6-piece). The Clearwater is available down to an 8'6" 3 wt; the smallest Orvis is a 4wt. The tube & rod weigh almost nothing and will fit either inside or strapped outside a backpack. I typically take a lightweight reel, a 9' 5x leader, 5X tippet, and one small box of generic dry flies (parachute Adam's, elk hair caddis, etc.). I hike up to alpine lakes where the trout are hungry and will nail anything that even barely resembles a floating bug.