"The best mechanic is only as good as its tools." Some version of this aphorism seems to arise in every technological society, and it is as true for galaxy-spanning civilizations as it is for pre-industrial species just progressing beyond banging rocks together. Likewise, developing more and varied tools inevitably leads to inventing toolkits. Toolkits themselves are as varied in shape and appearance as their purposes. Swinging doors or lids with nested organizer trays are common, but many variants use drawers, small compartments, or even telescopic designs. A craftsman installing doors in buildings or ships might have a toolkit that looks different than one a maintenance technician uses to repair droids. A toolkit's contents might likewise vary from simple rotary securement tools and spanners to complicated devices of Mon Calamari or Verpine design. A toolkit might even contain some simple consumable parts used for repairs.
While uses may differ, all toolkits serve the same basic purpose: a container to organize one's tools to prevent loss or damage. Most toolkits are watertight to prevent corrosion, and some are designed to prevent static charges that would damage sensitive electronics. Professionals are keenly aware that their tools are their livelihood, and even most hobbyists would be ashamed to leave their tools scattered about haphazardly. While a toolkit may become scraped and dented with wear and bear stains and odors from various solvents, coolants, or lubricants, the tools inside will be preserved in working condition, ready for their next use.