Certain airlines offer very low prices on flights, and then charge for things most airlines include. On Frontier, a carry-on bag is $35-$60. I avoided the fee by using luggage that was small enough to be considered a “personal item” (It has to be under 14" high, 18" wide, 8" deep). A lot of backpacks will meet the size requirements. I have a Swissgear rolling bag, similar to this one. It held enough summer clothes for a 4-night trip, plus a gadget case, a toiletries bag, and my 13-inch laptop with charger. — MF

On our last trip my husband and I shared one large suitcase for a week. This 4-piece set of packing cubes by Amazon Basics (I bought two sets) kept it from getting out of hand. Everything stayed organized and folded. I like that they’re soft and not rigid, because they expand as you fill them up and saves space when you don’t. The long, slim cube was perfect for my hair styling tools. — CD