* The Amount of Hair Left Out: The more hair you leave out, the less weave you'll need. If you're doing a partial sew-in (e.g., leaving out a significant amount at the top for blending or a large portion around the perimeter), one pack might be sufficient.
* Length of the Weave: Longer weaves typically require more bundles to achieve fullness. If you're using a longer length (e.g., 20 inches or longer), one pack might not be enough, even with leave-out. Shorter lengths (e.g., 10-14 inches) are more likely to work with one pack.
* Density/Thickness of the Weave: Some weaves are naturally denser or thicker than others. A very dense pack might provide enough volume, even with leave-out.
* Desired Fullness: Consider the look you're going for. If you want a very full, voluminous look, one pack is unlikely to be enough, even with leave-out.
* Sew-in Technique: Some sew-in techniques, like using smaller braids or a tighter weaving pattern, can allow you to use the weave more efficiently.
* The Type of Weave: The amount of hair you need will depend on whether you are using wefts, a wig, or individual strands.
Ultimately, it's best to consult with your stylist. They can assess your hair, understand your desired look, and advise you on whether one pack will be sufficient or if you'll need more.
In general, it's often better to have slightly *more* hair than you need rather than not enough. It's easier to remove excess hair than to try to make a small amount stretch too far.