Apparatus and associated methods relate to an article of luggage having a coupling interface with a plurality of support points to engage a dynamic volume receptacle (DVR). In an illustrative example, the DVR having a predetermined capacity may releasably couple to the plurality of the support points when inserted through an auxiliary aperture to form a barrier between contents inserted into a primary chamber of the luggage and contents inserted into an auxiliary chamber of the DVR. The DVR may include a capacity adjuster to permit a user to modify the predetermined capacity of the DVR. Advantageously, a user may modify the predetermined capacity prior to insertion of the DVR into the primary chamber. In some implementations, the DVR may protect the contents in the primary chamber against moisture from wet contents in the DVR, for example.