I've found my weight drops as much as 5# on a long ride, and that's even with drinking a bottle an hour. I don't consciously try to 'drink it back' after the ride, but I drink water pretty freely over the next 8 hours.
Originally Posted by
TrojanHorse
You've got your weights wrong too - a liter of water is 1,000 grams = 1kg = 2.2 lb.
I don't know what you're calling a long bike ride but I routinely drink 24 oz of water an hour when riding, and if it's hot enough, I'll drink as much as 48 oz of water an hour.
I didn't see the OP say it was a liter, just a bottle. And the water in a 24 oz bottle weight 24 oz - 1.5 lb.