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The Micro II from Sea To Summit is a great sleeping bag for backpacking. It compresses down to a very small size, lofts back up quickly and is made of top quality fabrics, down and industry leading technology. I have used the bag on a several night backpacking trip where temps dipped into the high 30’s and was pretty warm but I did use the Sea To Summit liner when I did get a little chilly to add a little more warmth to the bag.

Here are some of the specs from Sea To Summits website:

The Micro series are our lightest weight bags, fully-featured and filled with 850+ Loft Eastern European Goose Down. These bags incorporate our 2D NanoShell™ providing the lightest most breathable water resistant shell.
Designed with a contoured mummy shape, the Micro series is the lightest and most compact sleeping bag in its class. With a unique drawcord opening at the foot for effective temperature regulation, the Micro series can be converted from an open duvet to a technical box foot mummy sleeping bag.033RR_3_hires 032RR_4_hires

Focused on achieving ultra lightweight performance, this bag uses a YKK #3 zipper with micro anti-snag and quilted baffle construction to optimize down placement; resulting in the best warmth to weight ratio fully-featured sleeping bag.
Form fitting, the Micro series uses a 55/45 fill ratio to insulate your core as the bag rotates with you throughout the night. A security pocket located inside the bag is easily accessible, ideal for stowing electronics to preserve battery performance in cold conditions. The soft touch lining fabric is down proof by construction and highly breathable offering a comfortable sleep.
The Micro series is our choice for cycle touring across the Pyrenees, adventure travel on the Inca trail in South America and fast & light backpacking in the Sierras.Seat Summit Micro II sleeping bag

Box Quilted Mummy Convertible
The quilted baffle construction provides consistent down density throughout the sleeping bag ensuring the down is where you need it most. Traditionally quilted sleeping bags relied on sewn through construction resulting in cold spots across the seams. Quilted baffle construction eliminates these cold spots, using lightweight 3 dimensional baffles to secure the down across both X and Y axis.

The Micro McII is the smallest lightest sleeping bag we offer, it is an amazingly warm bag for such a small size.

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Features: Box quilted mummy convertible, 2D NanoShell™, differential cut shell, box quilted baffles, 55/45 fill ratio, anti-snag along side zip, hood drawcord with dual adjustment, YKK #3 side zip, drawcord foot closure, large sized internal zip pocket, includes lightweight Ultra-Sil® compression bag, mesh storage cell and laundry bag.
Down: 850+ Loft 95% European Goose Down
Fill weight: Regular 250 g/9 oz | Long 275 g/10 oz
Bag weight:Regular 550 g/1 lb 3 oz | Long 625 g/1 lb 6 oz
Length / zip options: Regular – right zip | Long – left zip
Season Ratings: Indoor/Summer/Spring/Autumn, EN Rating (Lower limit) 36F/2C
Suggested use: Ultra lightweight trekking, Travel, Hiking, Camping, Cycle touring, Alpine style climbing
Compression bag: XSmall – 6L to 2L