Another simple but must have product for all sports card collectors. We are talking about regular sized hard plastic top loaders. These provide your cards the ultimate protection against anything that your cards could face.
Once a card is put into a standard sized sleeve (http://youtu.be/FFlb0r46mOk), slip them into one of these. They are great for shipping or just storing your more valuable cards. Similar to sleeves, they are are great for sports cards, magic the gathering, Yu-gi-oh and pokemon cards.
I do not recommend using these for relic cards, mat cards, triple threads, etc because they do not fit cleanly into these top loaders. Use thicker sleeves and larger top loaders.
Protect your cards and protect your investment.