Trapper Keepers are binders. Did they also make folders? Regardless, asked and answered yeronner: not big enough for a whole term. Things fall out if you turn your bag upside down or put the folder in upside down
They did make folders that were branded I believe. The Trapper keeper also featured pockets on the front and rear covers.
> Things fall out if you turn your bag upside down or put the folder in upside down
Rare problem from memory. The folder is usually easy to orient as it would have a pattern or picture. Same if it was in your binder. In addition, the pressure of the folder being in your binder or between books usually clamped the pages in place. There were also vertical and semi vertical pocket folders that prevented an upside down incident from spilling the folder contents.