In the sports card collecting world, team bags are one of the most overlooked necessities. I really enjoy the versatility of them because they can hold several cards or protect top loaders. The prices of top loaders are extremely expensive, typically $4 to $6 for a package of 10 to 25 thick top loaders. By putting a team bag around them, you prevent scratches and other damage.
They are also a must have for shipping. Team bags prevent cards from flying around and even falling out of the top loader.
A pack of 100 team bags typically go for $3 to $4, which is still expensive for what it is, but still another must have.
Feel free to ask me any questions.