The most secure place to keep it is on your person *under* your clothing. Waterproof protection would be a good idea if you're in a warm climate.
It most certainly can be done--I wore mine basically 24/7 for a year. The only time it wasn't under my clothing was for border crossing or bathing--and in the latter case it almost always was under a traveling companion's clothing. No close calls--but someone else in the group wasn't so cautious and hers was snatched. Fortunately, the thief wasn't sophisticated, kept the cash and dumped everything else quickly.
It most certainly can be done--I wore mine basically 24/7 for a year. The only time it wasn't under my clothing was for border crossing or bathing--and in the latter case it almost always was under a traveling companion's clothing. No close calls--but someone else in the group wasn't so cautious and hers was snatched. Fortunately, the thief wasn't sophisticated, kept the cash and dumped everything else quickly.