$bin_file_data{$sampname} = @bindata;

##</code><code>##

$bin_file_data{$sampname} = \@bindata;

# a different way that copies @bindata as opposed
# to taking a direct reference to it

@{ $bin_file_data{$sampname} } = @bindata;

##</code><code>##

# use the whole array

for (@{ $bin_file_data{$sampname} }){
    ...
}

# get a single element

my $thing = $bin_file_data{$sampname}->[0];