A "splitboard compatible only" carry system is designed specifically for splitboarders who take their board apart into two ski-like halves for the uphill climb. These packs usually feature side straps—often called an A-frame carry—that hold each half securely alongside the pack, rather than strapping a whole board flat against the back.
The most important thing to know is that these packs cannot carry a solid, one-piece snowboard. If you ride a regular snowboard and need to strap it to your pack for a hike, this carry type won't work for you. You'll want to look for a pack with a vertical or horizontal snowboard carry instead.
This option is strictly for dedicated splitboarders. If you skin uphill in split mode, this tailored carry system keeps your halves balanced and accessible. But if you ever ride a solid board, skip this feature and choose a pack with a traditional snowboard attachment.