Thanks for your review.
Once you do try the bag, hope you do like it and suit your needs.
With regards to your concern regarding if they are waterproof or not, they are fully waterproof. You will obviously be able to confirm this yourself, but this little video may perhaps shed some light:
As for wear and tear, and the material they are made from are ultralight but also sturdy and designed for backpacking use and what this entails. These have been very successfully used for years on long distance treks, the Great Divide trail and some 'around the world' bike tourers. Hopefully after some use, you will be happy with them and perhaps change your initial opinion.
For the 'sway' of the saddle bags. Almost all saddle bags will sway, depending on the terrain and riding style. We also have a very useful 'anti-sway' bar system that can be used on any saddle bag that you can use if this really becomes an issue. Those bars can also double as bottle cage holders. Info on that is here: https://cycletouring.shop/products/ani-sway-rack-for-bikepacking-saddlebags
Thanks again and we appreciate the purchase and review.