Around 2 years ago, I bought a Marmot atom sleeping bag which is a pretty standard light weight down 3 season bag. I like the bag a lot but if I were looking today for a light weight sleeping system, I'd take a long hard look at a quilt system rather than a sleeping bar. I used one last summer for the first time and loved it. I can't recommend what I bought since it's really only a summer quilt and you're better off with a 3 season one.
For a tent, there are a number of reasonable weight double wall tents. I'm looking to get a new one and I'm leaning towards the MSR bubba nx 1. It's not the lightest tent out there but the weight is reasonable and, by all accounts, it is a sturdy tent. I like the size as well. It also has a usable vestibule which I like.