SNOO Sacks are designed to be used in SNOO and only in SNOO…BUT you can get the very same award-winning swaddle—complete with our escape-proof inner bands and arms-out shoulder snaps—with our Sleepea Swaddle. The only difference between SNOO Sack and Sleepea is that Sleepea is wing-free, making it the ideal swaddle to use outside of SNOO.