Yes. The material recommended for BIAB bags is very strong. If you have bought a BIABrewer-approved bag or made one using the instructions given here Should I Make a Bag or Can I Buy One?

Similiar limitations on kettle-size and burners that apply to traditional brewing also apply to BIAB though. (see the FAQ above, “What are the advantages and disadvantages of varying size kettles?”)

Whilst it isn't overly hard to pull a double-batched bag from the kettle especially with a coarser crush which drains more easily it is not recommended and could pose a real safety hazard. To avoid these problems, BIABrewer considers a rope and pulley set-up as being essential for double-batches.

If you have questions regarding this topic, feel free to ask them here.