Nemo Disco 15 Sleeping Bag review: Excellent for side sleepers Disco Women's Endless Promise Down Sleeping Bag Disco Men's Endless Promise Down Sleeping Bag Disco Men's Endless Promise Down Sleeping Bag Disco Men's Endless Promise Down Sleeping Bag. Disco continues to reign as the ideal down backpacking bag for side sleepers, offering the plushest comfort possible on the trail. Seventy percent of all people sleep on their side, which is why NEMO designed the iconic Spoon Shape bag to fine tune the balance between comfort and packability. The Classic Spoon shape is the sweet spot of the series, with a generous cut at the elbows and knees so sleepers can shift positions comfortably throughout the night. (Even with the roomier silhouette, this bag packs down remarkably small.) Premium 650 FP hydrophobic, RDS certified down ensures traceability throughout the supply chain and provides superior warmth for cold nights. This 3 season backpacking bag is loaded with features, including Thermo Gill vents that help regulate temperature during the night, a Blanket Fold draft collar that provides tucked in comfort, and a waterproof breathable footbox to withstand tent condensation. Left sided zippers on the mens style and right sided zippers on womens allow two Discos to zip together for a double version of these favorite sleeping bags.