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That’s a great point, Rob. Hydration is definitely one of those things that can make or break a hike, especially in the warmer months. I’m with you on the taste issue with bladders—some are worse than others, but even good ones can still have that plastic aftertaste. Almost all our bladders taste horrible now, despite the brand. Bottles are definitely better in that regard and are one of the reasons my wife and I switched to aluminium bottles. Mine are 1.5-litre capacity, while hers are 1 litre each.
You mention some bags facilitate more frequent drinking. I am a bit of a water guzzler, so it’s easy for me to drink a few litres on a walk. My wife, on the other hand, prefers to put lip balm on rather than drink when she needs to, and it wasn’t uncommon to get back from a day hike to see she had only had a few mouthfuls. With the bottles, she drinks a whole lot more, without me nagging.
Agree the side-entry pocket design on the Osprey packs is fantastic. Being able to grab and stow a bottle without taking your pack off makes a huge difference in keeping up regular hydration. Julie and I usually hike together, so it’s pretty easy to share bottles or grab the other person’s when needed. I’ve seen a few other brands with similar access, but Osprey really seems to have nailed it with the opening along the leading edge. When I first started wearing Osprey packs, I was still inserting my bottles from the top, but the side entry makes life so much easier. Huge selling point for me too.
I’ve worn other packs, such as the AARN Featherlite Freedom Pro, and was quite disappointed in the side pockets. They are so low-cut that I have to clip my bottles in place with a carabiner for fear they will simply fall out.