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$ perl -e 'print pack q{H*}, sprintf q{%2x}, 0x3a;' | hexdump -C
00000000  3a                                                |:|
00000001

$ perl -e '
print pack q{(H*)*},
   map { sprintf q{%2x}, $_ } 0b111010, 072, 58, 0x3a;' | hexdump -C
00000000  3a 3a 3a 3a                                       |::::|
00000004

$ perl -e '
print pack q{(H*)*},
...
00000060  60 61 62 63 64 65 66 67  68 69 6a 6b 6c 6d 6e 6f  |`abcdefgh
+ijklmno|
00000070  70 71 72 73 74 75 76 77  78 79 7a 7b 7c 7d 7e 7f  |pqrstuvwx
+yz{|}~.|
00000080