Single Sandbox Bundle Deployment Model
You can develop and test bundles using a single sandbox account. This simplified model is appropriate for smaller customization projects. With this model, administrators and testers can work on bug fixes and customizations in sandbox without disrupting normal business activities in production. However, this model includes the risk that development or testing activities could interfere with each other.
After you develop and test a bundle in the same sandbox account, you can safely install it in your production account.
You can also test bundles created by administrators in other companies or by ISVs in a single-sandbox environment prior to installing that bundle in your production account.
For information about installing a bundle, see Installing a Bundle.