Zip ties, velcro, channel guides, punch down harnesses, gangways, and so forth. Just be sure to add strain relief by utilizing anchor points in the case so you

Zip ties, velcro, channel guides, punch down harnesses, gangways, and so forth. Just be sure to add strain relief by utilizing anchor points in the case so you don't have 20lbs of cabling hanging off a few RJ-45 sockets.