What is recommend a Swaddle Sack vs a Sleeping bag?

These 2 products have different purposes.
Red Nose recommends a light weight cotton or muslin wrap for wrapping/swaddling
A “swaddle sack” is a commercial form of a swaddle, which is not promoted by Red Nose.

A sleeping bag is appropriate from birth (as long as it is not too large - especially around the neck)
https://rednose.org.au/article/what-is-a-safe-sleeping-bag

Most parents use a swaddle in the early weeks, but use a safe sleeping bag (with arms out) once baby is rolling.
https://rednose.org.au/article/safe-wrapping-or-swaddling-when-to-stop-and-how-to-select-a-safe-sleep-bag

Red Nose has some information about wrapping & swaddle products.
Scroll down to towards the end of the page for this information.
https://rednose.org.au/article/wrapping-babies