Hello Kathy and thank you for posting to our community.

Since the Priority tyvek envelope is not considered one of the USPS flat rate or regional options, we would recommend selecting the Package option under the Custom Packaging for the Priority service.

We are sorry to hear that you found our separate login/password requirement for the community unpleasant. ShippingEasy uses a third party support environment provided by Zendesk, which allows us to invite participation from anyone, with or without a ShippingEasy account. 

While this creates a uniquely open community for everyone, we recognized the need for a separate support log-in, to maintain the security and privacy of your ShippingEasy account.

In an effort to make the additional support log-in easier, we encourage the use of Facebook, Twitter, or Google account credentials. Registration is free and easy, just click here.

We hope you'll understand that the separate log-ins are strictly for security purposes, and are in no way meant to be an inconvenience