Used by one baby for 1 month in a smoke free pet free home. Size: Large: 18-26 lb MRSP $45 just for the sleep sack, but I will throw in two sheets as well as pictured (ocean themed). “Why SNOO Comforter Sack? SNOO Sack helps babies sleep better and safer by mimicking the cozy embrace of the womb and keeping them securely on their backs in SNOO. SNOO Comforter Sack is our warmer, cold weather sleep sack that has a Thermal Overall Grade (TOG) rating of 2.0.”