When I was abroad last year, I ended up spending quite a bit in charges by using my debit card abroad. On my return, I did some research, and discovered that WeSwap currency card, which seemed to be one of the best alternatives. It's a prepaid Mastercard that has different currency wallets, and works by giving better conversion rates by swapping your money with other travellers. I'd definitely recommend checking it out if you've got any upcoming trips that it might be useful for. Also, feel free to use this referral link which gives you £5 at sign up and additional £5 when you top-up with £50 or more.
Referral for £10 bonus: http://swp.to/en/jik7585
You can join if you live in one of the following countries: United Kingdom, Ireland, France, Germany, Italy, Spain, The Netherlands, Norway, Sweden, Denmark
You can load your WeSwap card in the following currencies: Danish Krone (DKK), Euro (EUR), Pound Sterling (GBP), Norwegian Krone (NOK), Swedish Krona (SEK)
You can use your WeSwap card to swap between the following currencies: Danish Krone (DKK), Euro (EUR), US Dollar (USD), Turkish Lira (TRY), Canadian Dollar (CAD), Swiss Franc (CHF), Australian Dollar (AUD), New Zealand Dollar (NZD), Hungarian Forint (HUF), South African Rand (ZAR), Japanese Yen (JPY), Hong Kong Dollar (HKD), Singapore Dollar (SGD), Polish Zloty (PLN), Pound Sterling (GBP), Norwegian Krone (NOK), Swedish Krona (SEK), Israeli Shekel (ILS)