bag film material is injected through the hole 120 under heat and pressure polyethylene particularly high density polyethylene is suitable for use with some film materials containing or made of e v a it may be desirable to use for the injected plastics material a plastics a material which includes up to 10 of e v a to obtain compatibility with the bag film the skilled man in the art will naturally choose suitable materials in the light of the bag film being used temperatures and pressures conventionally employing in injection molding the chosen plastics material are suitable in this instance the injected material is then allowed to cool and the blocks are opened during the cooling the collar shrinks which reduces the likelihood of leak paths being formed the resulting product is illustrated in fig9 as will be seen an out collar 122 is molded around and integrated with the material of the tube 110 and the portions 12a 14a fig3 of the bag film material due to the application of heat and pressure during the injection molding step the likelihood of the resulting product having leak paths such as leak paths lp of fig2 is greatly reduced referring now to fig1 12 the illustrated bag outlet tube 110 suitable for use with fig7 9 includes an integral stopper 112 the tube 110 is made in one piece with a bag wall attachment block 114 a web 28 and an outlet portion 18 the latter is flexible so that the tube 18 can be folded up and its open end engaged with the stopper 112 whereby an obturating member 23 of the stopper 112 closes the outlet end.