How to detect movement of gadget without electricity
Microswitches are available in a range of formats, are very small, are mechanically simple and very reliable.



Figure 1. A selection of microswitches.

The lever types are very sensitive so little force is required to operate them due to the lever's mechanical advantage.






simulate this circuit &ndash; Schematic created using CircuitLab

Figure 2. Wiring is as a simple as using the normally-closed contact (which will be usually open when the weight of the container is applied to the switch).