If a pack lists 'No Snowboard Carry,' it means there's no dedicated attachment system designed to hold a snowboard. While you might be tempted to jury-rig something with the straps, it won't be secure or comfortable—and a bouncing board on a steep hike is genuinely dangerous.
These packs are built specifically for skiers, with carry systems like A-frame or diagonal attachments that simply don't accommodate a snowboard's width and shape. It's one of the most common mistakes snowboarders make: assuming any ski pack will work for their board.
If you're a snowboarder, look for packs with vertical or horizontal snowboard carry options instead. 'No Snowboard Carry' packs are great if you exclusively ski—you're not paying for features you won't use—but they're a hard pass for anyone riding a board.