Small least:
- Sandbags to slide into the slots in the jacket does not seem very strong, handle with care to avoid leaks,
- Slight discomfort in wearing the jacket at the back of the neck. The slight discomfort becomes large after a few minutes (perhaps because there is more weight in the rear). It's not too disturbing if we limit the port of the jacket, by removing between each set or exercise. That said, we come to the next point,
- The jacket is binding enough to put / remove. It would be interesting to add before closing system (zip, clips, buttons or other) in order to withdraw without having to raise it over your head.
So some drawbacks, but I remain broadly satisfied with the product.
Please note the description is inaccurate: fully charged the jacket is 14kg and not of 20kg.