Credit: Travel + Leisure Choosing a backpack as your carry-on is a practical choice for a long travel day, freeing up your hands for an airport coffee and making it easier to squeeze through the narrow aisles of the plane. But some backpacks are better for travel than others, perhaps designed with isolated shoe compartments, holes to feed your phone charging cable through, jewelry pouches, and special materials that simply wipe clean after picking up germs from public floors. This under-the-radar Bagsmart backpack has all the above, and it’s under $40. Reviewers consider it a “hidden gem” of Amazon’s brimming luggage section, deeming it even better-quality than brand-name bags triple the price. Read on to discover what makes it a real “dream bag” that’s won over travel agents, urban commuters, and overpackers alike. Bagsmart Travel Backpack Credit: Amazon $37 at Amazon The Bagsmart bag is about 17 inches tall, 12.5 inches wide, and 8 inches deep, fitting within many airlines’ underseat size limitations.…