Darlings on-the-go Office

You conjure an extra-dimensional office inside your choice of case you use that lasts for the duration. 

Once the spell is cast and the case is open, it reveals a step ladder going down into an office space that is a 30 foot square and is 10 feet from floor to ceiling. The office is designed as the caster wishes, but always includes a work desk, comfy chairs, a book shelf (with or without books), a cork board or chalkboard, parchment, quills pens and ink. Other office supplies may be added if they are brought in, but must be carried out if they do not want to be left in the office. If any of the materials created by the spell are removed from the office, it will disappear in a flash of red light. The atmosphere inside the space is comfortable and dry, regardless of the weather outside. When the spell ends, or if the caster dies, any creatures and equipment brought into the office are safely ejected and appear in an unoccupied space closest to the case.

The office can hold up to nine creatures of medium size or smaller. Only the caster or specific individual(s) can open, and enter the case. However, the case can be moved by anyone. The case remains lightweight regardless of its contents. The office and creatures inside the office are not affected by movement of the case but can hear the area around the case as if they were in the space, but creatures cannot hear into the case. If the case is thrown or dropped, the creatures inside the office do feel a rumble. Spells and other magical effects can't extend through the case or be cast through it and the case itself cannot be destroyed while the spell is active.