33" bins come with 2 already
Your review: These work great, fit just fine, and accomodate the 33" bin lid.
Of course, the fit isn't watertight. Still enough space for a jigsaw blade to slide under the divider.
With the max of 7 of these installed in the 33" bin, the width of each compartment is 3.5". Interior height is 4" to the top of the divider (& lid, if installed).
My 33" bins came with 2 dividers each, so you may need to order less packs of dividers...