Hi @jimhd I think there are some newer more compact BIPAP machines that are easier to pack and take with you. I found some reviews that point to the ResMed AirCurve 10 VAuto w/ Humidifier as one of the smallest/best BIPAP machines. I get a little confused reading the reviews trying to determine if it's a BIPAP machine - the list says it is but reading the description on the manufacturers website seems to reference it as an Auto CPAP. I would have a discussion with the medical store before making a decision. Here's one of the review sites I found that may be helpful.
https://snoringabc.com/best-bipap-machines/