Google is trying to revolutionize email again with Inbox by Gmail, which the company unveiled in October. It’s still available on an invitation-only basis, but Google says it’s already received over a hundred thousand pieces of feedback on the product.

If you’ve been wanting to try it, but haven’t been able to score an invitation, you’ll be happy to know that Google is opening it up for a limited time. If you send an email to [email protected] from an @gmail.com address before 9am Friday PST, you’ll get your invite.

Google also shared this infographic looking at how people have been using the product so far. This is where email marketers might want to pay attention. Inbox presents both new opportunities and challenges for getting messages in front of users, so take note of how they’re using it so far.

For one, usage is heavily slanted toward Android, which isn’t much of a surprise. At 33%, promos take the top spot in the bundles department. Bundles are where Google puts a bunch of messages together into a neat little package for the user. This is one of Inbox’s main features, and 85% of messages are bundled. 60% of users apparently sweep away their bundles twice a day.

Take a look at all of that and more below.

Many in the email marketing industry have already offered their early thoughts about how marketers can prepare for Inbox adoption. We ran through a lot of those here.

Image via Google