FIT4HOME Aqua Bag Water Weights - Alternative to Sandbag (Loughton MK5)

Pipe to fill with water included plus foot pump to fill it with air to retain shape.

Good thing if you want to exercise with unpredictable forces generated by the moving and splashing water inside.

I would have liked to keep it, but not finding enough to time to use and maintain it as well as a spot to keep it when filled (eg. Outdoors). Upto 20 litres capacity so you have good flexibility on the amount of weight you can exercise with. There will be some residual water inside that is difficult to remove. It'll be good if you can keep it filled and in use, otherwise, as you can see, the inside will have to be cleaned with something appropriate occasionally because of the water left inside the item.

More details about the item here: https://www.amazon.co.uk/dp/B09FK8F9RT