The Amazon basics aren't as nice as the eagle creek regular ones, but they are better priced and of a good enough quality. I really wish Amazon had a mini cube or something that was about half the size of the small ones. If you have a little more money to spend, the Eagle Creek specter line is impossibly light but do feel durable enough.

However, for collared shirts and any dress pants, I prefer my eagle creek garment folder that I have, especially in duffel bags because that item provides some great structure to the bag. Can fit a number of shirts in there along with pants that will stay wrinkle free (or have very little wrinkles). I recently got a small to go along with my Medium for short trips or if I am taking a longer vacation and have both a checked bag and a carry on.