A fluid container usable with an image forming apparatus including a receiving unit having a plurality of receiver slots, the fluid container comprising: a housing unit including a plurality of wall portions and a fluid chamber configured to store fluid therein, the housing unit configured to removably attach to a respective receiver slot of the receiving unit of the image forming apparatus; a first key set disposed on an exterior surface of one wall portion of the housing unit, the first key set configured to form a first key pattern corresponding to a conforming first receiver key pattern of a respective receiver slot; and a second key set disposed on an exterior surface of an other wall portion of the housing unit, the second key set configured to form a second key pattern corresponding to a conforming second receiver key pattern of the respective receiver slot; characterized by: a guide member disposed on the one wall portion of the housing unit, the guide member configured to engage the respective receiver slot and guide the housing unit therein when the fluid container is installed in the receiving unit, wherein the one wall portion and the other wall portion of the housing unit form an angle (θ) with each other, and wherein the other wall portion of the housing unit is configured to be a leading end of the housing unit when the fluid container is installed in the receiving unit, the other wall portion of the housing unit is positioned closer to at least a portion of the guide member than the other wall portion is to the first key set. a housing unit including a plurality of wall portions and a fluid chamber configured to store fluid therein, the housing unit configured to removably attach to a respective receiver slot of the receiving unit of the image forming apparatus; a first key set disposed on an exterior surface of one wall portion of the housing unit, the first key set configured to form a first key pattern corresponding to a conforming first receiver key pattern of a respective receiver slot; and a second key set disposed on an exterior surface of an other wall portion of the housing unit, the second key set configured to form a second key pattern corresponding to a conforming second receiver key pattern of the respective receiver slot; characterized by: a guide member disposed on the one wall portion of the housing unit, the guide member configured to engage the respective receiver slot and guide the housing unit therein when the fluid container is installed in the receiving unit, wherein the one wall portion and the other wall portion of the housing unit form an angle (θ) with each other, and wherein the other wall portion of the housing unit is configured to be a leading end of the housing unit when the fluid container is installed in the receiving unit, the other wall portion of the housing unit is positioned closer to at least a portion of the guide member than the other wall portion is to the first key set. a guide member disposed on the one wall portion of the housing unit, the guide member configured to engage the respective receiver slot and guide the housing unit therein when the fluid container is installed in the receiving unit, wherein the one wall portion and the other wall portion of the housing unit form an angle (θ) with each other, and wherein the other wall portion of the housing unit is configured to be a leading end of the housing unit when the fluid container is installed in the receiving unit, the other wall portion of the housing unit is positioned closer to at least a portion of the guide member than the other wall portion is to the first key set.