The Quad Pak memory card, like all High Frequency products, was released exclusively in Toys "R" Us stores. It shares the same form factor as Mad Catz' x4 and x16 memory cards, but comes in a translucent grey shell. Like the Mad Catz cards, the Quad Pak memory card also has two arrow-shaped buttons and an LCD screen, and also includes a memory card case and label. Although the package calls this memory card a "Quad Pak", there is no branding on the memory card.
Trivia
The Quad Pak packaging is a mostly-yellow blister package and there is no difference hardware-wise between this and the High Capacity Memory Card that High Frequency released in 1998.