A linear pump for pumping a fluid includes a generally tubular shaped bladder 50 sealingly engaged on each end to an end cap 20, 25, forming an inner chamber 14, and including each of an inlet 70 and an outlet 75 inner chamber check valve to fluidly interconnect the inner chamber with the fluid. Each of a plurality of linear motors 40 each may be connected on one end to a respective support rib 30 and on an opposing end pivotally connected to one of the end caps. The support ribs are flexible and have a central portion of the rib engaged with a central portion of the bladder. The plurality of linear motors may be selectively actuated to cause the plurality of support ribs to alternately flex and/or straighten out such that the bladder is condensed or expanded respectively to effect a change in volume of the inner chamber, thereby drawing in or displacing fluid. Bladder extensions 160 may be used to slidably connect the bladder to a respective rib.