Flying Spirit or Frontier and want to avoid those pesky carry-on fees? This Carbrea personal item bag is your secret weapon. It measures 17.7x12.4x7 inches, which fits perfectly under the seat on budget airlines that require personal items to be 18x14x8 inches or smaller. The 25L capacity is surprisingly spacious - I've fit several days' worth of clothes, toiletries, and essentials in mine. The polyester material is lightweight (only 5.3 ounces) but durable enough for regular travel. What's really clever is the foldable design - when you're not using it, it packs down tiny to store in your luggage or closet. The trolley sleeve lets you slide it over your suitcase handle, and the front pocket gives quick access to your phone, passport, or boarding pass. I've used mine on multiple flights and it always fits under the seat without issues. It's not just for air travel though - I've used it as a gym bag, overnight bag, beach tote, and even for grocery runs. For the price, you're getting a versatile bag that saves you money on airline fees while being useful for so many other situations. It's one of those travel essentials that pays for itself after just one flight.