Umutwe wanyuma ni ikintu gikoreshwa mu gupfuka no kurinda imiyoboro, ibikoresho, cyangwa ibikoresho, bikoreshwa cyane mu nganda zikora inganda, ubwubatsi, hamwe na sisitemu. Imipira yanyuma ikozwe mubyuma, plastike, reberi, cyangwa ibikoresho, hamwe nuburyo butandukanye kugirango bihuze imiyoboro itandukanye cyangwa ibikoresho.