pressure so as to release substantially all of the water or saline contained therein into the pocket 2 immediately prior to use of the catheter 3 typically the urine collection bag 1 with integrated sachet 6 and where pre packaged therewith the catheter 3 will be sterilised using ethylene oxide since the sachet 6 contains sterile water or saline there is no need for sterilising the contents of the sachet 6 accordingly the material of the sachet 6 is preferably impermeable to ethylene oxide and water non limiting examples of materials meeting these requirements are poly vinylidene chloride pvdc aluminium foil laminates and metallised films for example metallised poly ethylene terepthalate other sterilisation processes could of course be used instead for example by irradiation in which case the fluid in the sachet 6 could be sterilised in situ at the same time as the rest of the components of the apparatus 10 the volume of the sachet 6 is sufficient to release such an amount of water or saline into the pocket 2 to enable wetting of the insertable length of the catheter 3 immediately prior to use by u201c insertable length u201d is meant at least that length of the elongate shaft 18 which is coated with a hydrophilic material for example pvp and inserted into the urethra of the patient typically this will be 80 140 mm for a female patient and 200 350 mm for a male.