Speaker backpack

I wanted to pimp my backpack with the use of some Bluetooth controlled speakers, so I ordered some parts from aliexpress.com and started designing some enclosures for the speakers and the Bluetooth board. I used 2 speakers of 3W each and a 5v Bluetooth stereo board. This stereo board can be powered by any power-bank or phone charger. I also used some watertight connectors so that I was still able to disconnect the stereo board from the speakers.
The total project costed approximately €12,- and it is a fun gadget. All used parts from aliexpress.com are listed here below:

- The used 3W 4ohm 2" inch speakers:
https://nl.aliexpress.com/item/4000355748366.html?spm=a2g0o.productlist.0.0.53db6ed5ms0EOc&algo_pvid=59be3429-8e35-4f5a-ab16-379422bbeda5&algo_expid=59be3429-8e35-4f5a-ab16-379422bbeda5-0&btsid=2100bde116093256389867731e0d16&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

- The used 3W 5v bluetooth 4 stereo board:
https://nl.aliexpress.com/item/1005001555679292.htm