Black Hole 3L Packing Cube

The 3L size swallows my toiletries, chargers and cables with room to spare, and it still slides into my carry-on without bulging. Zipper feels burly enough that I'm not babying it.

Bought this as a dopp kit and the 3L size fits my toothbrush, razor, and a couple of bottles without any squeezing. The fabric feels tough enough to toss around, but it still packs flat when empty.

Tossed this in my carry-on for a weekend trip and it held all my toiletries plus chargers without bulging. The 3L size is just right for a dopp kit, and the fabric feels tough enough to survive being stuffed in a backpack.