Oxa Fashion via Amazon offers the Oxa 20-Liter Waterproof Dry Bag in Blue or Orange for $16.65. Coupon code "7GS8IRVH" cuts it to $11.65. Plus, Prime members bag free shipping. That's $14 off list and the lowest price we could find. It features removable and adjustable shoulder straps.

Also, Oxa Fashion via Amazon has it bundled with an Oxa Waterproof Phone Case and two Oxa Drawstring Bags for $19.99. Coupon code "7GS8IRVH" cuts it to $13.99. Plus, Prime members bag free shipping. That's $19 off list and the lowest price we could find.