A support unit is provided for a liquid filled flexible packaging bag having a length, width, and thickness, and which enables such a bag to be stored horizontally while enabling liquid contained within the bag to be withdrawn as and when required. The storage unit (1) has a support panel (2, 12, 14, 19, 26, 42) for a liquid filled flexible packaging bag which is adapted to support the packaging bag in an inclined orientation at least after a proportion of the initial content of the bag has been removed. The support panel corresponds generally in plan view to the length and width of the packaging bag and is usually located inside a flat shape of box (6, 46) capable of storage on a shelf of low height. The support panel may be arranged to move from a horizontal position to a progressively more inclined position as liquid is removed from the bag. A liquid supply system is also disclosed.