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A bag is provided for containing a liquid intended to be supplied in a controlled manner to some other site, for example to a medical patient. The main bag portion has a pair of overlying side walls joined together around their edges, the side walls having integral extensions which together define a

A bag is provided for containing a liquid intended to be supplied in a controlled manner to some other site, for example to a medical patient. The main bag portion has a pair of overlying side walls joined together around their edges, the side walls having integral extensions which together define an outlet region in communication with the interior of the main portion of the bag. The extensions are bonded together to define a tube-like passageway extending throughout the outlet region from the interior of the bag. The extensions are adapted to permit the connection thereto of a peristaltic pump device co-operable with the tube-like passageway to control the out-flow of liquid from the bag.

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1. A bag for containing a liquid intended to be supplied in a controlled manner to some other site, comprising a main bag portion having a pair of overlying side walls joined together around their edges thereby to define a reservoir for the liquid, the side walls having a pair of integral overlying

1. A bag for containing a liquid intended to be supplied in a controlled manner to some other site, comprising a main bag portion having a pair of overlying side walls joined together around their edges thereby to define a reservoir for the liquid, the side walls having a pair of integral overlying extensions projecting from the conjoined edges so as to form a pump area projecting from one side of the bag, the extensions being bonded together to define a tube-like passageway having a section of part circular form and extending from the interior of the reservoir for fluid to an outlet region at an edge of the pump area, the extensions being profiled and adapted to permit the connection thereto of a peristaltic pump device having pump members driven around a circular path centered on the center of said section of the passageway, whereby the connection of the peristaltic pump device to the extensions and co-operable with the passageway controls the out-flow of liquid from the reservoir.2. A bag as claimed in claim 1, wherein the passageway comprises successively, as considered from its reservoir end to its outlet region, a generally linear first portion, the part-circular second portion, a part-circular third portion extending round the outside of part of the second portion, and a linear fourth portion.3. A bag as claimed in claim 1, wherein the passageway comprises successively, as considered from its reservoir end to its outlet region, a generally linear first portion, a part-circular second portion, a part-circular third portion, with the second portion extending round the outside of part of the third portion, and a linear fourth portion.4. A bag as claimed in claim 1, wherein the outlet region of the passageway is provided with a socket or spigot for the direct connection thereto of an intravenous catheter supply pipe.5. A bag as claimed in claim 4, wherein the socket or spigot is separately formed and is bonded to the extensions to communicate with said passageway.6. A bag as claimed in claim 1, wherein the extensions include registration openings for mating with corresponding projections provided on a peristaltic pump with which the bag is to be used, to obtain alignment between the passageway in the extensions and pumping members of the pump.7. A bag as claimed in claim 1, wherein the passageway in the extensions is defined by lines of thermal, sonic or RF welding bonding together the two overlying side walls forming the extensions.8. A bag as claimed in claim 1, wherein the end of the main bag portion remote from the extensions is provided with an integral suspension hanger.9. A bag as claimed in claim 1, wherein, as viewed in cross-section, the passageway is defined by a flat portion of one of the extensions and a convexly curved portion of the other of the extensions.10. A bag as claimed in claim 1, wherein the main bag portion defines a plurality of sub-portions for separately containing a plurality of liquids, and wherein the extensions define a corresponding plurality of passageways each of which communicates at its upstream end with a respective one of the sub-portions.11. A bag as claimed in claim 10, wherein the plurality of passageways run substantially parallel to one another.12. A bag as claimed in claim 10, wherein the passageways merge with one another before the outlet region thereof.13. A bag as claimed in claim 12, comprising mixing means for assisting mixing of the liquids after the passageways have merged.14. The combination of a bag as claimed in claim 1 and a peristaltic pump, the extensions of the bag being configured for cooperation with the pump whereby liquid may be pumped from the bag at a controlled rate.