  Current sheets are ubiquitous in the solar wind.They are a major source of
the solar wind MHD turbulence intermittency. They may result from non-linear
interactions of the solar wind MHD turbulence or are the boundaries of flux
tubes that originate from the solar surface. Some current sheets appear in
pairs and are the boundaries of transient structures such as magnetic holes and
reconnection exhausts, or the edges of pulsed Alfv\'{e}n waves. For an
individual current sheet, discerning whether it is a flux tube boundary or due
to non-linear interactions, or the boundary of a transient structure is
difficult. In this work, using data from the {\sl Wind} spacecraft, we identify
two three-current-sheet events. Detailed examination of these two events
suggest that they are best explained by the flux tube crossing scenario. Our
study provides a convincing evidence supporting the scenario that the solar
wind consists of flux tubes where distinct plasmas reside.
