India, May 15 -- On my recent holiday, I reached a point where I could not tolerate carrying a bulky backpack all day. I wanted a simple sling bag with a wide strap and just enough room for essentials. The only problem was my water bottle. I drink nearly four litres of water a day. And in hot, humid destinations across Asia, stepping out without one is not an option. After plenty of searching, I found water bottle sling bags, and they are genuinely brilliant. They hold your bottle securely and often include small pockets for cash, hotel key cards and a forex card. This tiny addition made walking 20,000 steps a day in Singapore, on a cruise, and at Universal Studios feel far more comfortable and easy to manage, unlike a bulky backpack.

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