i used to have a 4-space gator polyethylene rack case that i used with a crown K2, ampeg SVP-BSP, and peavey max. the total weight was about 65 pounds. i was not happy with how the rack shape deflected over time. now i have a warwick quadruplet preamp and a crest pro 7200 power amp and i'm looking for the right 4 space rack option. i wanted to go rack bag: i called the manufacturer and they said the weight of my rig should be ok with the rack bag, and it has zippered front and rear flaps to allow plenty of airflow. nice. but now i'm concerned about having space for the front handles of my amp with the front flap zipped. i'm also concerned there won't be much protection for the knobs of the front of my preamp. sweetwater doesn't keep these in stock, so they couldn't answer my question. i may have to call the manufacturer again. i'm a little reluctant to spend $100 on a rack case, however, that will not stand up to the rigors of use. i don't want to go full ATA flight case as that is heavier than i'd like. i think i've pretty well eliminated every choice, though. any suggestions, personal experiences, anecdotes, or scary stories to offer? any help is appreciated. robb.