5Pcs Black Waterproof Plastic Electric Project Case Junction Box 3.94 x 2.36 x 0.98 inches(100x60x25mm).

I used one of these boxes to package a small 2-transistor amplifier built on perf board. There is room for the board, a power switch, and a 9V battery. I like the way the case snaps together without screws, making it easy to change the battery when necessary.

Put a step down buck converter and Arduino Nano in this as an LED strip driver box. It's driving 2x 15ft strips for a total of 270 LED's. Drilled a hole for the power and USB in and LED out wires. It arrived in a larged padded envelope. I didn't receive any damaged units like the other reviewer. I suppose that's just the luck of the draw when it comes to being damaged during shipping in an envelope. Lid snap fit style, very well made snaps together no problem and flush, functions as intended. Perfect for my needs, very happy with it. :)

I had to work to get a couple of these to open. Not really a bad thing. These were a little smaller than expected but worked for my project. All in all not bad

I've used these boxes for my last dozen esp8266 projects, and just bought some more. They're a perfect size, and the quality is good. I'm not sure how other reviewers ended up with broken boxes; my last order also had 10 pounds of diatomaceous earth in the shipping box, and they came in intact. In fact, the boxes are somewhat flexible and well packaged together, so you'd have to drive over them with the car to break them. They're easy to work with a nibbler or drill bit. Love them!

There is no edge seal. I filled one with water, and it immediately poured out from the various holes between the snap-on lid and the box. It might be water resistant if placed in an area protected from water. Its a nice box for indoor use with electronic and other small parts. However used outdoors, humidity will leak in because of the poor seal, and cause metal parts to rust or corrode.

The perfect size for my active antenna project, made with the amplifier circuit board from a Dressler ARA-30. Still waiting for the I/O connectors so I can finish this box.

EDIT: big 2 star up grade! These fit 3,18650s perfect and there is room for a small 3p BMS. Also there is set of stand offs for a PCB as well.. Shinny plastic box.. Not the dull solid ones I am used to. Fells flimsy compared to others. But the price is cheaper and it is a bit bigger then the normal ones as well.. Not going to stomp on it so.. It will work..

ONWON -These are the worst Boxes ! Don't buy. Chips when Drilling. One box split entirely in half! Lids are not secure and uneven fitup. VERY BRITTLE Pinfox is a more professional box, easy to machine. A couple dollars more for (5) but well worth it! Don't Buy Onwon boxes