A housing (12) with an opening at a first end (A) and a plurality of holes at a second end (B), a plurality of hollow tubes (16) (e.g. flexible), attached to the plurality of holes, a plurality of containers (18) (e.g. inflatable balloons) removably attached to the hollow tubes (16), and a plurality of elastic fasteners (20) (e.g. o-rings), each elastic fastener (20) clamping each container (18) to a corresponding hollow tube (16), such that when the containers are filled (e.g. simultaneously) with fluid (e.g. water, air, helium) and detached from the corresponding hollow tubes, each elastic fastener automatically seals (e.g. self-seals) each container with the fluid inside. The containers may be water balloons or body fluid (e.g. blood, urine) sample containers with inelastic base and flexible top portion.