I purchased a "Kyss" bag for our trip to St. Maartin and it worked well for us. It is a bag with an attached thin chain and small tumbler lock that you can wrap around your chair or palapa. The lock loops through the zipper so nobody can get into your bag or swipe your bag discreetly. I found it gave me peace of mind when my hubby and I went for a swim or a walk. It is a good beach bag whether you use the lock feature or not. Retail for the large bag is about $40. Good luck.