Great question — answering as the UphillTech team:
A mug outside the backpack is far easier to reach . In some areas, you will pass streams very often. During my first ever backpacking trip, with a group of Swedish people hiking Kaisepakte – Pessiskåtan – Lapporten – Tältlägret – Abisko in September 2005, most people had a mug hanging outside so that they could reach it immediately. Every 5 minutes or so, we would cross a stream and people would drink a few draughts. I believe some of them did not bother to carry a water bottle at all, as we were probably never more than 500 metre from a stream during this hike. In fact, Swedish mugs often have a hole specifically for attaching the mug outside the backpack: Typical mug as used in...
Full answer by gerrit: https://outdoors.stackexchange.com/a/10914 (CC BY-SA 3.0).
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