For east coast/lowland (ie warm and humid) I greatly prefer a synthetic bag as it's easier to wash, and dries faster if (when) it gets damp on a trip. The newer materials have gotten very close to the loft and weight of down, and the difference is negligible in warmer temperatures. Also, if it matters to you, the down suppliers are a particularly cruel industry, right up there with foie gras- I won't judge but maybe you will.
Your down coat could be the product of cruelty - Salon.com
If weight is really the priority then using a bivy bag instead of a tent adds warmth and a light sleeping bag liner or fleece is all you need, with a pair of wool tights, wool top and maybe a hat is all you need in Summer. I use a bivy bag for solo bike touring, and it's easy to just tuck into the woods somewhere quiet and out of the way to vagabond it, fast and mobile and no fuss if you want to be discreet and avoid noisy campgrounds. Load Jack London's
The Road on your smartphone for a good night time read about vagabonding if you want some inspiration while you're hiding from The Man.
+1 on Big Agnes bags, I have a Wind Lip- 34 ounces, rated to 30 deg or so, I've been comfortable into the low 20s covered with a just a bivy sack (sheltered out of the wind) and 1 layer of midweight fleece, hat and warm socks. If anything, I find most similar rated bags too warm in Summer at low altitudes and humidity above 50% or so, a fleece blanket or bag liner is more comfortable and lighter. But the BA Wind Lip is a nice light synthetic bag that fits your specs without using down.
Big Agnes Wind Lip Sleeping Bag - Free Shipping at REI.com
Sort of related, but I just had several nights on rocky ground on the Appalachian trail with a new toy- a 9 ounce sleeping pad that packs to the size of a tennis ball. I had my doubts about it's comfort but REI has a good return policy and the weight was too tempting- and I love it, very (surprisingly if you look at it) comfortable, extremely light and compact, so nice to downsize what's usually a major pain in the ass.
Inertia X Frame
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