Possessor of HP dm1 (11.6), buy this cover in peace, mine goes all battery inside. Initially I hesitated to make a cover for 12 see 13 inches, thinking that cover 11.6 (max) would be too tight (which could force the zipper for example), but no, this cover is perfect. Poor quality but adequate. Great opening practice. Received on time, ordered 20 (Sunday), received on 23.