In well travelled camp places, there is sometimes a problem with ants.
On our desert hikes, we usually spend a few days at the beach in a pretty basic but very nice camp.
There is a massive number of ants, which are so tiny that you could easily overlook them, just tiny black slashes of 2mm.
They can access any box or container, and will chew through most of the usual plastic wrappers.
So if you leave the backpack just plain resting on the floor, after one day your food most likely is spoiled.
Even hanging the pack or the foodbag off a chord will not solve the problem, but just postpone the issue for another day or so.

First solution I found so far is, to spray the chord the foodbag is hanging on with Moskito repellent.
Works fine for a few days, but eventually the repellent will fade and the ants come back.

Then I had the idea to apply a "Cup" to the middle of the chord, fill it with water and by this create a barrier that no ant will be able to pass.
Now I'm asking if anybody ever heard about or seen such a "Cup"?
If not, I'll produce one my own to see how it works.