Sleepsacks and swaddlers

FTM here, lo is 7 weeks and has been wiggling out of swaddle. Doesn't sleep well for naps and has good and bad nights..we've only been swaddling her so far with blankets but thinking of trying a sleep sack . Been reading reviews on the halo and woombie. First of all let me say we do not co sleep and my main concern is is it a suffocation hazard? Baby's safety is more important to me than if I get a good nights sleep . I've read some of the sleep sacks end up bunching up around baby's neck. But hoping we can find something! Thanks!