Not sure if there is a lost and found area in this forum, but I found a Camelback on the Main Yarra Trail near the Eastern Freeway section on Friday 22 February 2019.
If you lost your brand new looking drink bottle I'd like to reunite you with it! Just PM with a description.
Not sure the owner will see this but I guess it doesn't hurt to try.
If anyone knows of any other lost and found forums that might have better exposure please let me know - I'm not on facebook anymore so can't use the groups on that thing.