A shaving razor cartridge (12, 1012) comprising: a housing that extends between a front end and a rear end and defines an overall width, the housing comprising: a blade support portion positioned between the front end and the rear end and comprising: a cap; and a guard spaced from the cap and cooperating with the cap to define a shaving plane; and a handle interface portion positioned between the front end and the rear end and comprising: a front wall comprising a lower surface and an interior surface; and a rear wall (48, 1048) comprising a lower surface, a central portion, a first distal portion, and a second distal portion; and at least one razor blade disposed in the blade support portion between the cap and the guard, the at least one razor blade extending laterally between opposing sides of the blade support portion, wherein: each of the first distal portion and the second distal portion extends from the central portion; the central portion, the first distal portion, and the second distal portion comprise respective interior surfaces; the lower surfaces (58, 60) cooperate to define a lower opening (64, 1064); the front wall and the rear wall (48, 1048) are spaced from each other such that the interior surfaces cooperate to at least partially define a handle receptacle that extends to the lower opening (64, 1064); the interior surface of the central portion is spaced horizontally from the front wall by a first distance; the interior surface of the first distal portion is spaced horizontally from the front wall by a second distance; and the first distance is less than the second distance. a housing that extends between a front end and a rear end and defines an overall width, the housing comprising: a blade support portion positioned between the front end and the rear end and comprising: a cap; and a guard spaced from the cap and cooperating with the cap to define a shaving plane; and a handle interface portion positioned between the front end and the rear end and comprising: a front wall comprising a lower surface and an interior surface; and a rear wall (48, 1048) comprising a lower surface, a central portion, a first distal portion, and a second distal portion; and a blade support portion positioned between the front end and the rear end and comprising: a cap; and a guard spaced from the cap and cooperating with the cap to define a shaving plane; and a cap; and a guard spaced from the cap and cooperating with the cap to define a shaving plane; and a handle interface portion positioned between the front end and the rear end and comprising: a front wall comprising a lower surface and an interior surface; and a rear wall (48, 1048) comprising a lower surface, a central portion, a first distal portion, and a second distal portion; and a front wall comprising a lower surface and an interior surface; and a rear wall (48, 1048) comprising a lower surface, a central portion, a first distal portion, and a second distal portion; and at least one razor blade disposed in the blade support portion between the cap and the guard, the at least one razor blade extending laterally between opposing sides of the blade support portion, wherein: each of the first distal portion and the second distal portion extends from the central portion; the central portion, the first distal portion, and the second distal portion comprise respective interior surfaces; the lower surfaces (58, 60) cooperate to define a lower opening (64, 1064); the front wall and the rear wall (48, 1048) are spaced from each other such that the interior surfaces cooperate to at least partially define a handle receptacle that extends to the lower opening (64, 1064); the interior surface of the central portion is spaced horizontally from the front wall by a first distance; the interior surface of the first distal portion is spaced horizontally from the front wall by a second distance; and the first distance is less than the second distance. each of the first distal portion and the second distal portion extends from the central portion; the central portion, the first distal portion, and the second distal portion comprise respective interior surfaces; the lower surfaces (58, 60) cooperate to define a lower opening (64, 1064); the front wall and the rear wall (48, 1048) are spaced from each other such that the interior surfaces cooperate to at least partially define a handle receptacle that extends to the lower opening (64, 1064); the interior surface of the central portion is spaced horizontally from the front wall by a first distance; the interior surface of the first distal portion is spaced horizontally from the front wall by a second distance; and the first distance is less than the second distance.