All content is accurate for 3.67 Frontiers.
The Starship and Exosuit have several inventory types.
Change between inventory types by selecting the appropriate icon from the starship or Exosuit pack in the Inventory Menu (TAB).
General Inventory space can be used for carrying cargo or installing upgrades.
Technology Slots are reserved for installing upgrades and other technology devices. Use these slots to expand your capabilities without compromising on storage space. When upgrading an Exosuit, these slots are cheaper than general slots.
High Capacity Slots are only found in the Exosuit. These slots are limited in number but have a significantly increased storage capacity. Objects stack in far greater numbers when placed in a high-capacity slot. These slots are expensive to upgrade.
Purchase new inventory slots at the Exosuit Technology Shop on a Space Station. Free upgrades can be found by using Drop Pod Coordinate Data in a Signal Booster.