1. Unfortunately, many virus composers are using these packers to make detection difficult and to defeat Signature base scanning.
2. Packers are basically used to reduce file size, so that to make uploading and downloading easy and fast.
3. They can also be used to protect software’s from modern cracking.

I burnt my mid-night oil to search lot of packers and finally i found there suite on a site.

Compression Test:
File used for that test Hackersorigin conducted is Firfox.exe 2.0 Original File size 7.30 Mb.

Packer Name——————-File after Compressed in MB
FSG 2.0————————–3.62
HotFusion.08——————–Binder
Mew 1.2 ————————-2.91
nsPack —————————2.74
Npack 2.0 ———————– 4.19
PeSpin—————————-3.67 
ARM Protect———————Protector
winUpackE .31——————-2.77
UPX 3.3 ————————-3.17 
PkLite32 ————————-4.39


Note: Your anti virus may report this as a virus, because packing files with some packers like FSG make the file specious, even you pack notepad.exe. So suspend your Antivirus and continue your work. yle="color: rgb(204, 204, 204);">

Packers suite Size: 4.08Mb Licence: FreeWare

Download Packers Suite

Some Shareware Packers/Protectors:
1) eXpressor
2) Mprotect
3) Aspack
4) Molebox Pro
5) Bitsum PE Compressor 2.0
.
.
.
Etc.