If you travel often, consider a dedicated travel PAP device. These are available in an extremely compact housing. Several brands are available, varying significantly in price and quality. Humidification is generally not available without adding a second device that adds significant bulk to the system. ResMed has a new air recirculation circuit that provides a modest degree of humidity when this is desired.
Please note: A valid prescription by a licensed healthcare provider is required for the purchase of PAP devices.