A disposable and collapsible bag packaging and connector system comprising: - a disposable and collapsible bag, having at least one chamber that is filled with a flowable resin compound product, e.g. an electrically insulating resin compound product, wherein the bag is adapted to be squeezed in order to expel the resin compound from the chamber, a first connector (10;110;110') for dispensing the product from the at least one chamber of the bag, the first connector (10;110;110') having a base body (11;111;111') that is secured to the bag, - a second connector (40;140) provided on a resin compound transfer member (30;100), which transfer member (30;100) has an internal channel for passage of the resin compound that is expelled from the bag by squeezing, said channel having an outlet, said second connector (40;140) being releasably connectable to the first connector, characterized in that that the first connector (10;110;110') comprises a first bayonet connection portion (13;144) and the second connector (40;140) comprises a second bayonet connection portion (44, 44a, 44b;113), so that the first and second connectors (10,40;110,140;110',143) are interconnectable by axial insertion of one of the first and second connectors into a bore (12;112) of the other connector, followed by a rotation over an angle of said inserted connector (40;140) relative to said other connector (10;110;110') so that the first and second bayonet connection portions reach a final connected position, wherein the first connector (10;110;110') comprises a rotary valve member (20;120;120') which is journaled to the base body (11,111,111') of the first connector, wherein the rotary valve member (20;120,120')- in a first angular position thereof relative to the base body (11,111,111') of the first connector- closes the chamber of the bag, wherein the rotary valve member (20;120,120') comprises a first coupling portion (21; 150) which - when the valve member (20;120,120') is in its first angular position - is adapted to couple directly to a second coupling portion (44a;151) on the second connector (40;140) upon said axial insertion of the one of the first and second connectors into a bore (12; 112) of the other connector, wherein - upon said rotation over an angle of said inserted connector relative to said other connector to said final connected position - the rotary valve member (20;120;120') is held stationary in angular direction relative to the second connector (40;140) by the cooperating first and second coupling portions (21, 44a;150,151) and is thus rotated to a second angular position relative to the base body (11;111,111") of the first connector (10;110,110'), wherein the rotary valve member (20;120,120') is embodied to provide - in the second angular position - communication between the product filled chamber and the internal channel in the second connector (40;140) allowing for discharge of the product from the chamber into the internal channel and there along to the outlet of said internal channel. - a disposable and collapsible bag, having at least one chamber that is filled with a flowable resin compound product, e.g. an electrically insulating resin compound product, wherein the bag is adapted to be squeezed in order to expel the resin compound from the chamber, a first connector (10;110;110') for dispensing the product from the at least one chamber of the bag, the first connector (10;110;110') having a base body (11;111;111') that is secured to the bag, - a second connector (40;140) provided on a resin compound transfer member (30;100), which transfer member (30;100) has an internal channel for passage of the resin compound that is expelled from the bag by squeezing, said channel having an outlet, said second connector (40;140) being releasably connectable to the first connector,