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I bought and used the decathlon poncho last year on the VDLP.
I really liked it and will be using it again this year - it was easy to don and remove, and I especially liked the zippers under the arms. It is on the heavy side at 508g
I used the tracking on this app. It showed where I was in relation to the VDLP. I had internet access and I found it particularly useful when I was entering and leaving cities where there were a lack of yellow arrows