Hi !
I have two irrigators just like your, but 1 liters are very small, and I think you have to fill it up meny times, going to the bathroom and back, it you use the bed for the action. I have a old fasion one too ( one liter +)Whie emalj with the blue ring on the top and with the same cize and the same problems. But this I prepher for some special accations. I feel it very erotic, becauce it is the same old one I used in my childhood. To this old one I use a glass-nozzle (dusch), as they always use in old days.
But to my daily cleenings I prefer a 2 liter irrigador, metalic, with hendle, brilliant.
I only need to refill one time. The first filling I put it on the nigthboard beside the bed, only 10 cm over my stomac. You can fall in sleep again when you are waiting 2 liters to go in. After it is empty, refilling, but this time you have to hold the irrigador higher, and this time it goes in very quickly. Relaxing is importend. You can do more if you feel for it. I usuel take a liter more in the bathroom before expelling. (5 liter together).
I have a 4-quarts red bag, but I prefer the irrigadors like you. In my country irrigadors was the most common, I beleeve. (Norway)
So I have 2-3 blue plastic bags from Spain, They have a 2 liters capacity, and take a litle place, for travelings. But I do not feel they are very erotic.
My most used nozzle is a green one with a big head and opening on the sides. Very nice and good. I have lot of other types too, but the big plugs hurt a lot when incerting and you need to use some time to feel wel.