Return to Question

I'm buying a double sleeping bag for travels with my girlfriend.
Parameters (of the bag, not the girlfriend): 1500g of goose down, 680 in³/oz (393 cm³/g), 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.

• Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?
• Question two: what would be the (approximate) T-comf for such solo sleeping?..

I'm buying a double sleeping bag for travels with my girlfriend.
Parameters (of the bag, not the girlfriend): 1500g of goose down, 680 in³/oz (393 cm³/g), 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.

• Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?
• Question two: what would be the (approximate) T-comf for such solo sleeping?..

NOTE RE: ZIPPABLE BAGS
Yes, I had had thought about them. However, there are a few cons:

1. They have to be Left/Right, i.e. matching. The company that I'm buying my bag from doesn't produce matching sleeping bags.
2. I've owned zippable bags and checked out some. All of them had one problem: the zip would stop at the shin level, basically creating two separate spaces for feet. That could be uncomfortable to sleep in (a double mummy-type bag would have a tapered but single feet space).
3. Two bags are more expensive than a single double bag, and we're talking down which already has a hefty price tag
4. Two bags (usually) weigh more than a single bag from the same model range

I'm buying a double sleeping bag for travels with my girlfriend.
Parameters (of the bag, not the girlfriend): 1500g of goose down, 680 in³/oz (393 cm³/g), 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.

• Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?
• Question one: what would be the (approximate) T-comf for such solo sleeping?..

I'm buying a double sleeping bag for travels with my girlfriend.
Parameters (of the bag, not the girlfriend): 1500g of goose down, 680 in³/oz (393 cm³/g), 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.

• Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?
• Question two: what would be the (approximate) T-comf for such solo sleeping?..

I'm buying a double sleeping bag for travels with my girlfriend.
Parameters (of the bag, not the girlfriend): 1500g of goose down, 680 cubic inches, 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.

• Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?
• Question one: what would be the (approximate) T-comf for such solo sleeping?..

I'm buying a double sleeping bag for travels with my girlfriend.
Parameters (of the bag, not the girlfriend): 1500g of goose down, 680 in³/oz (393 cm³/g), 90/10% down/feather, rated to -9...-15°C T-comf when two people are inside.

• Question one: Would I be comfortable sleeping in it alone or would the extra inner space sap my warmth? What if I hogtie the bag with a bungee/paracord?
• Question one: what would be the (approximate) T-comf for such solo sleeping?..