Decathlon - Forclaz Trek 500 59F Backpacking Mummy Adult Sleeping Bag Blue. This very compact lightweight bag has a wide temperature range of use. Sleep soundly from 59F to 77F (15C to 25C) w/ these 2 3/4 zippers w/ double slider to manage the temp: tailored ventilation. Easy to transport: Size L: weight 1.5 lbs. 4.5 liter volume. Compression bag. Sleeping comfort: Very comfortable mummy shape. 2 x 3/4 zippers with double slider for ventilation. Compatibility: Can be twinned with other models from the Forclaz Trek 500 range.