Some additional tips for keeping toddlers entertained during travel include having a few surprise toys tucked away specifically for these occasions. Dollar stores often have small, inexpensive toys that can become a special treat and provide some variety. I also stock up on cheap sticker packs and small coloring books, which don't take up much space in my bag and provide some quiet time entertainment.
For car rides, I keep a handful of snacks in the glove compartment - this seems to capture their attention because it's such an unusual spot to reach into and is a nice change from the usual snack routine. I also play the classic "I spy" game, which can pass some time and doesn't require any materials.
For flights, I make sure to bring a tablet loaded with kid-friendly movies or shows - this is definitely a special treat and provides a good distraction during long periods cooped up. Keeping a few of their favorite snacks tucked away in your purse can help buy you some extra peaceful moments too!