Mini-packs are great for travel. I used to have one for my kids when they were 18 months. We flew a lot so they would be big enough for 1-2 diapers, changing pad, travel wipes, and hand sanitizer. Plenty of room for a toy, book, and a snack. I would grab the pack for the plane restroom. Then refill it with the giant, hold-all, diaper bag. Plus the kids could carry their own stuff!