the two flat rate boxes will ship for $7.70 no matter what they weigh. The two sizes are (as printed on the boxes) 11" x 8 1/2" x 5 1/2" and 12" x 17" x 3 1/2". You could fit a 3 ring binder or a TCR nicely into the larger box. Magazines fit snugly into the smaller box.

Greg
R-6752