I loved the Halo combo swaddle/sleep sack when we were transitioning from swaddle to sleep sack (can wrap the swaddle around the chest to leave arms free/still give a snug “hug” to mimic swaddle), and now we’ve used both a regularHalo sleep sack (1.0 TOG) and this Touched by Nature sleep sack. Both are great, however the Halo has a double zipper if that matters to you.

I would recommend buying two so you can wash one while baby has one to wear.