I have both. I haave REI Flash 62. Its a nice pack. I havent used it in white. My only problem with the flash is the metal frame pops out if the pack is empty. My friends use it now when I take the backpacking. I also have an Osprey Exo 38. They make it in the 48 and 58 liter packs. Same suspension. I absolutely love it. Its the most comfortable pack i have ever worn. I tried on the Atmos and hated it. It wasnt comfortable at all. Take all your gear to REI and try on packs with your gear in it. Dont do the weighted bean bags. The weight isnt distributed correctly with those. Be sure to choose a pack for the amount of weight it can handle. The exo is an awesome pack but if you arent ultralight you will not like it