recesses 15 are closed by separate plastic sheet 18 which is releasably adhered to sheet 11 along the marginal areas 19 surrounding said plurality of recesses 15 by suitable means such as heat sealing sheet 18 on its outer surface i e the surface opposite that in contact with sheet 11 is permanently adhered to inner surface 16 of outer bag sheet 12 along longitudinal portion or separation seal 20 and sheet 18 is further adhered to sheet 11 by angular portions or guard seals 20a adjacent respective recesses 15 see fig4 all such connections designed to provide a sequential opening of recesses 15 during use which will be described in detail hereinafter a separate smaller independent bag 21 is disposed within larger bag 10 adjacent the longitudinal side opposite that on which recesses 15 are disposed or to the right as viewed in fig4 bag 21 is charged with the solvent medium e g water and is fabricated of suitable rupturable sheet material for purposes to be described at the interior bottom portion 22 of bag 10 is disposed second gas generating component 23 e g sodium bicarbonate or citric acid this component is in dry powdered form two time release capsules 24 containing the same gas generating component as the recesses 15 are.