This particular Thirsties cover is called Duo Snap and they come in two different sizes (1 and 2). Thirsties also makes sized diapers (XS, S, M, L) that are more tailored. I used an XS and really liked the fit on my 8lb baby.
Thirsties is a good diaper cover that’s well respected and lot of people like. It’s a solid, economical choice. Their covers have a single layer of PUL and double gussets, and they’re pretty roomy.
Thirsties also makes AIO diapers and fitteds (which need separate covers) that are all pretty good.
Review of Thirsties Duo Snap gives it 5 out of 5: Great Cover Comparison Thirsties
I think lots of people like Flips. For me, they seem quite big and didn’t fit for a long time – but I have a tiny baby. I do like to put Flip covers over very large nighttime fitted diapers.
Flips are just one layer of PUL, single gussets, and they flaps to tuck an insert under to keep baby’s tummy and back dry. The leg elastics are pretty soft.
Flip is a good brand, again under the Cotton Babies/BumGenius umbrella.
Review from Babycenter mama gives 3 out of 5: Great Covers Comparison Flip
Grovia is technically an All-in-2 (AI2) system. I thought it looked like a nice cover, so I got one to try out. I never use it because it has a crazy mesh inside that means I have to wash it after every use. Not cool. I don’t understand what this mesh is for.
Stretchy flats are my favorite! This one is made of bamboo/cotton; there’s a smooth side and a side with teeny tiny baby loops. These flats are thicker than cotton and hemp, but they are more absorbent than cotton. The bit of stretch means it really fits baby well. If you usually pad fold your diapers, these are not for you. Padfolding is sort of a wasted on these lovely stretchies.
I use the origami fold so all the layers end up right in the middle and there are long, long wings to wrap around baby. I don’t even have to use a snappi because the wings tuck under one another. I made this blue edge one.
It looks so pretty I can hardly stand it. This pink one is from Sweet Iris Designs. When I pull in the wings, I sort of fold and twist until they’re nice and snug around her thighs.
The bamboo terry can also be snappi’d if you wish. If you’re doing a fold without long wings, they may need to be secured with a snappi, boingo or pins.