Back in September 2020, I was shopping in Daiso (and looked in Miniso, too, but it never seems to have anything suitable, and its prices are not as cheap) for some ink storage solution components, and came across this product — as well the 4 Cube Case, which is sized slightly differently.
I measured both products, and this one seemed to be a good fit for 60ml bottles of Platinum ink, if I decide to discard their cardboard retail boxes but still want to stack them high in storage. At the time, the store had ample stock of both products, so I figured I wasn't in a hurry to decide or buy; and my focus was on other things on the day.
A month later, when I revisited the store for the third or maybe fourth time, it looked to me this product may have been discontinued, even though there was still plenty of units of the 4 Cube Case; the shelf space originally allocated to this has already been repurposed with other plasticky bits and pieces of display stands. Given that there are two other Daiso stores within walking distance, I wasn't too worried; and when I visited another store (slightly further away than the one in Sydney CBD), it had ten or so units of these, which was relatively many. Phew! This could wait.
On my next visit, the two shown were the last units on the shelf, and seemed to have been left behind only because they were displaced and obscured by some other products of the sort; so, not that I have any immediate use for these right now, but I pulled the trigger on the spot.