I just got an AirFanta 5Pro a few days ago. Does it really fit in a carry on suitcase, and is it quiet? Yes, and it can be very quiet at lower fan speeds but is a bit noisy on max fan speed. I ordered the 5Pro because I wanted an efficient whole room air purifier that is packable. I've already got a number of air purifiers I can fit in a suitcase, but none of them have really high airflows like the 5Pro does with it's 4 filter, CR Box-style configuration. CADR At max fan speed, the 5Pro has an AHAM registered Clean Air Delivery Rate of 379 cubic feet per minute for smoke in an 8' high room that's 587ft². That's 4.8 air changes per hour, or a smoke-free room in 12.4 minutes - I've not tested the CADR myself, but the testing is certified by AHAM on their website. You'll get higher air changes per hour in a smaller room, and fewer in a larger one. ahamdir.com/directory Packability When disassembled, the stack of 5Pro parts is well under 8" high and fits in to my carry on suitcase, or even a shopping bag - just not a TJs bag because they are fairly narrow. Unlike a regular CR Box, the filters are inserted into plastic panels that form the sides of the 5Pro, making for a nicer looking and more durable design that can be assembled and disassembled quickly and securely. The panels have magnets for quick alignment, and all 4 filter panels are the same, so assembly is easy. When the 5Pro's top, bottom and sides are disassembled the stack parts is under 8 inches total. However, the filters are exposed on one side of the panels, subject to potential damage during transport if not handled carefully. The stacked 5Pro doesn't fit into my suitcase if I add the foam included in the original packaging in between the layers of filters. I've stacked the filters with the grills outward to protect them, but that does leave them rubbing filter to filter in the stack. I generally check my bags when flying, but without being able to fit in the foam packing that the 5Pro ships with, I'd be reluctant to trust the bare stack as checked baggage in my soft-sided suit case. Your suitcase may have more room than mine since mine has the roller-bag extending handles nested on the inside of the suitcase rather than on the outside, and your luggage may have harder, more protective sides. The fit and finish of the 5Pro is good. The included 12V power supply is compact. And the control knob is simple to use - push to turn on or off, and rotate for different fan speeds. The fan speed percentage is shown on the display. Noise Levels There is a built in particle counter and an optional auto mode based on particle count, but for me my sleep is less disturbed if fan noise, even if relatively quiet, is continuous rather than intermittent. So I'm more likely to use the manual mode. But I like that there is a built in particle counter and auto mode option. The noise levels have a wide range. At 25% fan speed, the sound levels are too quiet for me to measure since the room I tried out 5P in had 34 dB ambient noise levels. The reported SPL for 25% fan speed is 28.5 dB, and it is very quiet. The CADR at that speed is 72 CFM. Sound becomes noticeable, but still pretty quiet at 45% fan speed, with a reported 39.5dB at a CADR of 174 CFM. (For comparison, the durable Nukit Tempest Pro has a CADR of 222 CFM at 37dBA, but it doesn't fit in a carry on suitcase.) Fan noise is annoying at the max fan speed. It's not just the volume, which isn't that loud at its reported 53.1dB, but the whine of the 4 fans sounds like a loud desktop computer on turbo mode with fans pouring on the speed to cool down the CPU - it's a different sound than a larger single fan air purifier. However, you can choose your prefered sound levels / CADRs. AirFanta has published CADRs for the 5Pro's entire fan speed range in the FAQ "What is the smoke CADR, power and noise level in different fan speed?" near the bottom of the page. air-fanta.com/products/airfa… Overall, the 5Pro has delivered on it's promises. It has high airflow and packability all in the same unit. I wish the max fan speed was a bit more pleasant sounding, but there is the option to turn the fan speed down for quieter operation at lower CADRs. Shipping in the US was very fast, just a couple of days. YMMV. It will take time to tell how durable and reliable the 5Pro is in the long run. YouTube short with fan speed sound level examples at the link in the next comment. Not a sponsored post.