With a fantastic warmth to weight ratio small pack size and reasonable price point it is easy to see why the vango venom sleeping bags have long been incredibly popular for hikers backpackers and duke of edinburgh participants alike so it was hard to imagine that they could be improved in anyway that is until vango decided to upgrade the insulation to use ethically sourced and hydrophobic down with a 700 fill power to keep you warmer for longer by ensuring the duck down stays drier four times lo