It's not really your unpacks that are messy.

• The comments that parrot the obvious.
• Concatenation is used when interpolation or printf would be clearer.
• Some var names are needlessly long. ("load" doesn't add value.)
• Each record's size and crc are printed, but that's not data.

But your unpacks could be improved by treating the records as follows the following format:

header        body       footer
------------  ---------  ------
id body_size  size path  crc32
[download]

How I'd write it:

#!/usr/bin/perl

use strict;
use warnings;

my $mem = pack('H*', '54424c004100001300000BAD2F62696E2F7465737432302E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');

(my $section, $mem) = unpack('Z* a*', $mem);

print("$section\n");
print( ( "-" x length($section) ), "\n");

while (length($mem)) {
    (my $id, my $body, my $crc, $mem) = unpack('n n/a N a*', $mem);
    my ($size, $path) = unpack('N a*', $body);

    # Check CRC here.

    print("Load ID   : $id\n");
    print("Load Size : $size\n");
    print("Load Path : $path\n");
    print("\n");
}
[download]

TBL
---
Load ID   : 16640
Load Size : 2989
Load Path : /bin/test20.dfl

Load ID   : 16896
Load Size : 4
Load Path : /bin/test01.dfl

Load ID   : 17152
Load Size : 4
Load Path : /bin/test02.dfl

...
[download]

Update: Added enumeration at the top.

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