So, I got the Bambody small while waiting for my small-sized Knix period underwear to arrive. And, boy, is it better than the Knix brand! It's more comfortable, fitting, and absorbs loads more. I'm actually surprised how much better it is -- I was actually expecting it to just be okay.The first time I tried it on, it was more snug than I thought it would be. I was expecting it to be a little roomy but it fit me perfectly, which was a weird thing to feel. I also thought it would work like the overnight pads, which never absorbed as much as I needed and had me setting down towels before sleeping for those "just in case" moments. Nope! Bambody absorbed my worries. No liquid leaked out of the middle. Nothing went on to my towels.And the day was equally worry free. While I still was a bit cautious during the day, checking every now and then, nothing leaked over the sides and back or through the cotton-feeling material.Before I compare it to Knix, there were a few downsides, though YMMV.1) You ONLY get THREE panties, which is not enough for anyone.2) The feeling of liquid definitely gets strong if you have a heavy flow and you have to change every 5 hours. This is not an all day wear, if you were expecting that. Great for the night but definitely have to switch out during the day, like regular tampons, pads, or whatever you might have used previously. If you're not used to solely relying on pads, you WILL feel your monthly running down and on to the material, if that bothers you. Though, this means, if you're not on top of switching out, after getting used to menstrual cups or such, you WILL know when it's been too long from the squishy feeling of the panties.3) You have to hand-wash them and air-dry them -- or ignore those instructions, like I do and wash them normally, and tumble dry them on low/medium temperature. The material won't shrink nor will it become less effective, unless you dry it on high.4) If you air dry them, they take an annoyingly LONG time. Even overnight they'll still be slightly damp in the morning. Sun drying them shortens this time, but it's still longer than needed when having to switch between 3 panties. Though, throwing them on a heater/in front of a sun lamp really shortens that time to a more reasonable few hours.5) WHY 3 PANTIES???Now, I immediately noticed the difference between Bambody and Knix when my Knix Heavy Flow Period Kit came in.1) The material for the underwear looks and feels different. The middle is especially different from the rest.2) It doesn't fit as snug as Bambody, feeling a little loose comparatively.3) Gives you not 1, not 2, but FIVE separate pieces. MUCH better than 3.And then I tried them on for my second cycle. They're definitely good for period underwear and absorbed a good deal of blood. But, YMMV,1) There is some side leakage, after 3-4 hours, if a heavy flow. Not a great deal, where you're soaking, but definitely enough to feel and see.2) The sleeping boxers they provide are cute and don't allow anything to soak through, but there is still the problem of side leakage and a little bit of back-flow.3) Need to change every 3-4 hours, if heavy in flow.So, not as great as Bambody but definitely still good. Either way, whether Bambody or Knix, the one you go with depends on your needs. For now, I use Bambody for the first few heavy days and Knix for the lighter, last days of my period.