by 
The beguiling Pacsafe Dry 25L Backpack looks so sturdy that it would take dynamite to blow it open. The high-end piece of water-resistant kit boasts high-frequency welded seams and anti-theft tech to keep your gear safe, along with a laptop sleeve that doubles as a divider for wet and dry gear while the external straps allow you to affix more cumbersome essentials like your fins and jacket outside.