Organic Cotton Sleep Sack Blanche + Mimi Organic cotton Blankets & Sleep Sacks 100% GOTS Certified cotton Dew Estate Blue Signature Sleep Sack (0.5 TOG) Cosoco Kids Singapore Baby's First Blue Sleep Sack, 12 18 Months + Reviews Crate & Kids Canada Organic Baby Sleep Sack Sleeveless Muslin White Sleep Sack Under Dream Denim Blue 1.0 TOG Bamboo Viscose Sleep Sack gnamna. HALO SleepSack is the original wearable blanket for safe sleep, designed to help babies get better, longer sleep. As the next step after swaddles, it ensures a smooth transition with its zipper for easy diaper changes and a roomy, extra long sack that supports hip health and extends use. Crafted from breathable 100% cotton fabric, it offers cozy quality comfort your baby will love.