Perfect fit for the Plano pro-line storage boxes with 48 "pigeon holes". Bought these to hold resistors and other discrete components - easily holds loose or taped full-length-lead [bigger / longer / uncut ] resistors, and fits right into [turned sideways] the little Plano compartments. I've got seven of these little bags in each pigeon hole, each bag holding twenty to forty components of a specific value and rating.