There is at least one good reason to file your family’s I-485 applications in the same envelope. Namely, there is a discount when you are filing together with your child who is 13 years old or younger. If you submit your Forms I-485 in the same package the filing fee for the child is reduced to $750, instead of usual $1,140.
You may send few I-485 applications in one and the same envelope. Just make sure that all applications are distinct so that USCIS could differentiate papers of each family member.
If your family is filing multiple form I-485 applications it is advisable to separate the cases by fasteners or rubber bands. If you still worry about confusion you may additionally use separate sub-envelopes (marked I-485, name and A-number) and put them into one larger package. This will enable USCIS to identify them as separate cases and avoid possible delays, request for evidence or even rejection.
Also when preparing your packages, remember:
- Do not use heavy-duty staples, folders or binders that cannot be easily disassembled.
- Do not submit oversized documentation (unless it is required).
- Use fasteners or heavy clips to hold pages of thick applications together. Two-hole punching at the top of the papers is appreciated. Also you may use sticky tabs for locating items listed as attachments.
Note that even if you submit papers of your family together, according to the law USCIS will still handle each case separately.