At only 530g this is the lightest fully baffled sleeping bag that Western Mountaineering make. 

This sleeping bag is not only light weight but will see you fit down to about 0°.

This bag retains the features of many of the larger and heavier bags (minus a little bit of cold prevention) and manages to include a full length zip. 

Features:

• Full-length #5 YKK Zipper
• Insulated Draft Tube
• 4 (10cm) Loft, 0° C
• 5 1/4 (13.5cm) Spacing/Continuous Baffles
• 10 oz. (285g) Down Fill
• 59/38 (150cm/97cm) Shoulder/Foot Girth
• 1 lb. 3 oz. (540g) Total Weight