Although I have a portal hub room masquerading as a dungeon in the basement of my HQ, I have a portal beside me bed named "Transit". I carry portal parts to where I am exploring or harvesting, and place a "Transit" portal in a fixed up abandoned building in a relatively safe area. Those small 8 x 8 stone keeps fit a portal nicely after knocking down the inner wood stairs. Roof is optional. I build a portal in them with a chest behind it, while looking for a place to build a proper shelter.