Depending on the style you plan to wear, the length you select, and the size of your head, a minimum of two bundles is needed for a natural-looking sew-in. Three or more for a full look. Longer lengths (18″+) typically require three bundles. If you will be wearing a closure, you will usually only require 2 bundles of hair + closure.
The number of bundles purchased depends on the look a client is going for. Some clients prefer three bundles over two bundles, some prefer four bundles over three. It varies by client and their desired style.
Clients preferring a partial sew-in typically require only one bundle.