I hold my money in my hand. I can not even remember the last time I used wallet, it always gets lost especially when I make use of public transport. Most of what I purchase these days I make electronic transfer to the seller.
But if I can I hold my money in my hand tight.
In my experience, it has never been safe to put your money in the back pocket. You can lose the money at any time without even knowing it. Taking a purse with you will be the best way to keep your money safe with you.
This reminds me about the incident that happened to me while going to the store to get some foodstuffs. My money was in the back pocket and because the market was populated with people, I felt a hand in my body. Immediately, I remembered the stories about pick pocketing, I was feeling that my money has gone but God saved me. It's still intact.I don't think any money is safe in your back pocket because it is one of the easiest places where pick pockets can have access to without your knowledge. It is better for you to have your money in your purse or even your side pocket.