Containers for use in a beverage system are provided. The containers include a container body defining an interior hollow chamber, and having an opening leading to the interior hollow chamber, and a cap covering the opening. The cap has an inlet port with an inlet valve seated therein and movable between a closed configuration for preventing passage of fluid there through, and an open configuration for allowing passage of fluid there through. The cap also has an outlet port having an outlet valve seated therein and movable between a closed configuration for preventing passage of fluid there through, and an open configuration for allowing passage of fluid there through. The cap has a collar positioned around the inlet port, the collar has an inner surface with at least a portion configured to circumferentially engage a seal having an outer diameter in a range of about 7 mm to 8 mm.