@wutdis
Your link is not for the usual kind of enema bag/syringe. The item looks a lot more like an enema panty... rubber panties with an inflatable retention nozzle and bag attached.
The original amber latex "folding" or "travel" syringes were designed for women to pack in their suitcases, discretely hidden in small often rubberized fabric purses. Their purpose was clear, either douching before and/or after sex to be "clean and sweet" and/or not to have a bay. Since it was such a small addition, a rectal nozzle was included in the kit to help the woman poo after a long train trip for example. The advertising of the day shows this clearly.
In the air travel days, a train or car trip could easily take two days, so the need was clear, and confirmed by the dozen or so brands and models of the period.
Remember these bags : Arcross, Princess, Pullman, Starlet, journey-Aid, Defender, Symbol and Packette ..... And there were several Shy and Tiny Kit styles as well as the Compacto, Hyde-Away and Venus
The item in the link is far more a BDSM toy.