I use generic 4 x 6 toploaders for a lot of small stuff (rppcs, tickets, small photos?) so I can have the stacks of holders be more uniform.
Of course I have toploaders much smaller and bigger too but the more things I can put into one size the better.
http://www.ebay.com/itm/100-ULTRA-PR...q_xCVfSboTKM9w