{"slug":"sea-to-summit-spark-15","name":"Sea to Summit Spark 15","domain":"seatosummit.com","verdict":"As of 2026-08-12, Claude, Gemini, Grok collectively rank Sea to Summit Spark 15 #4 of 8 for sleeping bag for backpacking. Source: https://modelsagree.com/product/sea-to-summit-spark-15 (modelsagree.com, CC BY 4.0).","best_rank":4,"categories":1,"entries":[{"slug":"best-sleeping-bag-for-backpacking","title":"Best sleeping bag for backpacking?","rank":4,"of":8,"score":4,"appearances":1,"modelRanks":{"Grok":2},"reason":"Outstanding warmth-to-weight (~1 lb 9.7 oz with ~17 oz 850-fill Ultra-Dry down) and tiny packed size; hydrophobic treatment and reliable box baffles perform consistently in damp conditions; strong real-world three-season results with fewer cold spots than many peers.","reasons":[{"model":"Grok","reason":"Outstanding warmth-to-weight (~1 lb 9.7 oz with ~17 oz 850-fill Ultra-Dry down) and tiny packed size; hydrophobic treatment and reliable box baffles perform consistently in damp conditions; strong real-world three-season results with fewer cold spots than many peers."}],"fixes":[{"model":"Grok","fix":"ISO comfort closer to upper 20s than strict 15°F for cold sleepers; minimal features and delicate 10D fabric."}],"updated":"2026-08-12","rank_history":{"days":["2026-08-10","2026-08-12"],"ranks":[null,2]},"api":"https://modelsagree.com/api/v1/best/best-sleeping-bag-for-backpacking.json"}],"page":"https://modelsagree.com/product/sea-to-summit-spark-15","check":"https://modelsagree.com/check?q=Sea%20to%20Summit%20Spark%2015","updated":"2026-09-09T13:07:58.066Z","attribution":"modelsagree.com, CC BY 4.0"}