Yes, your passport and wallet (and probably some clean underwear) deserve to be at the top of your packing list. But in the rush to remember the essentials, travelers sometimes underestimate the power of the nice-to-haves. Humble objects, ranging from an empty reusable water bottle to bandages, can save time and money and go far toward boosting the quality of your travels. Here are the items we often forget to pack—and always regret not having in our suitcase.