https://rangersurplus.com/add-on-suggestions.php

Great care was taken to leave room in the "Universal" Gobag to add a few personal items. We designed the bag to be nimble enough to carry at 26.5 lbs.  Depending on whether you plan on humping it or parking it will guide your personal add-ons. Here is a list of a few suggestions. Please note that if necessary, gear can be affixed to the exterior of the pack as well.