Took this on a muddy walk and the treats stayed dry even after it got tossed around a bit. The clip is handy for grabbing kibble fast during training, though I wish the opening were a touch wider for my bigger hand. Solid little bag overall.
The water-resistant lining really holds up when my dog drags me through wet grass, and the treats stayed dry inside. Only gripe is the opening takes a bit of fumbling with one hand while holding the leash, but the clicker pocket keeps everything else handy.