Celestron C8 (HD) Main Mirror Bag Double - layer thickened shock - proof cotton, each layer of shock - proof cotton is up to 8mm thick. The surface layer is made of extra - thick and thickened 1680D double - strand Oxford cloth, which is strong, wear - resistant and tear - proof. Integrated design for hand - carrying and shoulder - carrying. Suitable for Celestron 8SE/C8 (HD) and other 8 - inch astronomical telescopes. Celestron C925 (HD) Main Mirror Bag Double - layer thickened shock - proof cotton, each layer of shock - proof cotton is up to 8mm thick. The surface layer is made of extra - thick and thickened 1680D double - strand Oxford cloth, which is strong, wear - resistant and tear - proof. Integrated design for hand - carrying and shoulder - carrying. Suitable for Celestron 9SE Evolution/C925 (HD) and other 9 - inch astronomical telescopes. Celestron C11 (HD) Main Mirror Bag Double - layer thickened shock - proof cotton, each layer of shock - proof cotton is up to 8mm thick. The surface layer is made of extra - thick and thickened 1680D double - strand Oxford cloth, which is strong, wear - resistant and tear - proof. Integrated design for hand - carrying and shoulder - carrying. Suitable for Celestron C11 (HD) and other 11 - inch astronomical telescopes. Fully Wrapped Thickened Inner Liner The inner liner is made of 8mm thickened cotton and sewn, which can wrap the main mirror in all directions. The outside of the inner liner adopts a double - strap design to further reduce shaking and protect the main mirror. Large Storage Space There are different styles of storage bags around the main mirror bag, which can hold astronomical accessories such as eyepieces and zenith mirrors, as well as water cups, etc.