Krystal Round Capped Bottles are used for dispensing drugs in tablet form. They have a child resistant cap for safety reasons. Pharmacists would use pre-capped bottles to save time and money. It would take around 20 minutes to stand and cap a full box of uncapped plastic bottles, which once opened must be capped immediately for hygiene reasons. Also in terms of storage you only have to have one box, rather than a box of caps and a box of uncapped bottles.