Embodiments of the invention provide a module collapsible accessory organizer for use with a luggage bag. The accessory organizer includes foldable compartments. The compartments can each be collapsed down when necessary to free up interior volume of the luggage bag in which the accessory organizer is placed. The compartments can stack and fold onto each other, and be inserted into or removed from a luggage bag. The compartments can be attached to each other. The compartments are modular such that the accessory organizer can be configured to include any desired number of compartments. The compartments of the accessory organizer are quickly unfolded and deployed for easy access to personal contents stored therein. The accessory organizer is a standalone organizer when not stored in a luggage bag. The accessory organizer can be manufactured and shipped as a standalone organizer, and then used with a variety of already-existent luggage bags of various dimensions.