I have Tamrac 5587 photographer backpack&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Tamrac-5587-Expedition-7x-Photo-Laptop-Backpack-Black/dp/B00148RMR6/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Tamrac 5587 Expedition 7x Photo/Laptop Backpack (Black)</a>&nbsp;with the optional large SPX-777 side pockets attached to it.&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/SPX777-M-A-S-Large-Padded-Pockets-Black/dp/B0009PAVIC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">SPX777 M.A.S. Large Padded Pockets (Black)</a>&nbsp;The MEDIUM Mountainsmith Rain Cover covers all of this easily with room to spare. As noted by others, these rain covers run quite large...I think I could also get it over a sleeping bag lashed to the bottom of my pack if desired. One note, a product feature listed here ("Hook-and-loop closure and angled cord attachment point") has nothing to do with the rain cover, it actually refers to the bag the cover is stuffed into. An example of mfr. trying to make something sound more exciting than it is...but at less than half the price of the Tamrac-brand rain cover, which does not fit my pack with the added side bags, this one from Mountainsmith is very reasonable. I haven't tested it in the rain but expect no problems and will update if I learn otherwise.