I chose the very worst time today to go for a walk! I had planned to walk down to the river and make some tea there, before walking back to the office and getting on with some work. I did not make it, the rain was so hard I turned back.
In the positive side I was using my Finnish Gas Mask Bag and it did an excellent job of keeping my Army water bottle, sit mat and backpacking cooking gear completely dry. The only thing to remember, to keep the rain out, is to make sure the lid is fitted correctly when fastening the bag.
The sun came out once I was back in the office!