I'm not sure it is 100% always going to work, but it seems to ;)

use strict;
use warnings;
use Data::Dumper;

my @packages = sort { $b <=> $a } (2,2,3,4,5,6,7);
print Dumper(@packages);
my @bins;
while (@packages) {
   my @temp = shift @packages;
   while (@packages) {
      last if sum(@temp) + $packages[-1] > 10;
      my $next = pop @packages;
      push @temp, $next;
   }
   push @bins, [@temp];
}

print Dumper(\@bins);


sub sum {
    my $s = 0;
    $s += $_ for @_;
    return $s;
}
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