I was going to get one, and might still yet. I gave away my big queen bed last year. I was watching my favourite Japanese YouTuber and he sleeps on a single trifold camping-type mattress. I got one, it's cheap and works a treat! It's light and tidy too, as Japanese beds can be very heavy. I like that it can fold easily, and doubles as a couch. Remember that anything thats on the ground needs to be aired and sunned. More on reddit.com

To get this out of the way, TLDR: A Japanese futon is not intended to be, and will not be, BIFL. The lifetime of a Japanese futon is strongly dependent on following what I think most non-Japanese people would consider pretty intensive care instructions -- like placing the futon on a breathable surface (e.g. tatami mats), folding up and packing away the futon every day, and airing it out in direct sunlight weekly. If you spill something on it, good luck -- traditional futons from cotton can barely be cleaned, and even then only by specialty futon cleaners, which are going to be hard to find outside of Japan, and no matter where you are, very expensive and the turnaround time isn't fast. I would consider something that will need early replacement without dedicated adherence to strict care instructions to not totally be aligned with the BIFL spirit -- sure, it may be quality, but durable and practical not so much. How long can you get out of a traditional cotton-filled Japanese futon in the best case scenario? You can go longer of course like with any mattress, but after the 10 year mark you're very likely to experience a very noticeable drop off in comfort. For this reason, traditional futon shops do offer services like futon reconstruction (see this link for an example) where they try to re-use some of the materials but essentially re-make it. Also worth observing is that most Japanese people do not use futons, and of those that do, most buy the newer, cheaper, synthetic futons from places like Nitori (which I'd consider Target-esque, to make a US retail reference). The sythentic ones can be washed in a washing machine, which for most people, increase the lifetime because it can actually be cleaned if something happens. All that is to say, even in Japan, traditional futons are an (expensive) dying craft and now a specialty product. If you think you might want to try one, I'd recommend getting a cheap synthetic version and seeing how you like it -- it is very different in feel and care from a typical mattress situation. And if you do decide go eventually go down the futon route, embrace that it is more wabi-sabi than BIFL. The https://www.reddit.com/r/floorsleeping/ sub is your best bet for recommendations I think. My background: Lived in Japan. Have slept on floor mattresses for the past 20 years and loved them despite their intensive care instructions and propensity to mold (particularly in humid climates, like the UK, but even in dry climates like California) if those care instructions are not strictly followed. Currently use one of the modern style trifold foam mattresses on a Japanese-made desiccation floor sheet from Nitori. More on reddit.com

Most futons are filled tightly with cotton batting which means there's no 'give.' They're like sleeping on a carpeted floor but at least the floor is flat/level. Cotton filled futons will develop lumps from general use and especially from folding. If the cotton futon is filled tightly enough it is extremely difficult or near impossible to remove the lumps. A foam filled futon would be preferable. Both my sister and I had cotton filled futons and hated them to the point where they were headed for the trash. Then we each bought PREMIUM memory foam toppers which are 2.5 - 3 inches thick and simply lay on top of the futon. HEAVEN. All houseguests also report heavenly sleep. I write 'premium' because many products that call themselves memory foam are false claims. They're just ordinary foam. Check the reviews and be certain that you can return it easily. The cost of a cotton futon and memory foam topper will still be many hundreds of dollars less than most premium mattresses. Edit: that futon you linked to is cotton filled, as hard as the floor and will probably develop persistent lumps. More on reddit.com

Beds arent just for sleeping. Idk how old you are but as an adult I use my bed for more than sleep. More on reddit.com