A filter (10) for filtering fluid, in particular air, water, fuel, oil, or urea-water solution, in particular of an internal combustion engine, in particular of a motor vehicle, a multiple-bellows hollow filter element (44), a filter housing (30) of a filter (10), and a seal (90) of a hollow filter element (44) are described. The filter (10) comprises at least one filter housing (30), which comprises at least one inlet (28) for fluid to be filtered and at least one outlet (36) for filtered fluid. At least one hollow filter element, in particular a multiple-bellows hollow filter element (44) can be arranged in the at least one filter housing (30) such that it separates the at least one inlet (28) from the at least one outlet (36). The at least one filter housing (30) comprises at least one first housing part (42) having at least one installation opening (40) for the at least one hollow filter element (44), which can be closed using at least one second housing part (38). The at least one hollow filter element (
