I’ve tried putting a bottle on the top tube using strap on bottle holders. I placed it directly in front of seat tube pointing forward. I found it to be secure and easy to access, but it only increased my water capacity by one bottle so it wasn’t really a big game changer. I’ve also used a 2 bottle holder that mounts to the rear of the seat. It works well as long as the bottle cages used hold the bottle very tight. Otherwise, the bottles can bounce out when you hit a bump. Hydration packs work well, but what I have found I like better is a frame bag such as the Relevate Tangle that hangs underneath the top tube. It will easily hold a 2 liter reservoir and has a small opening at the front of the pack that is designed to run a hydration hose through. I use one of my wife’s hair ties to secure the hose to the bike’s stem. It keeps it out of the way but easily accessible when I want a drink. Cheers!
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