A sushi belt for all 7 science packs that uses a 7 to 1 balancer and stack filter inserters instead of circuits. It can keep 1 side of a blue belt saturated and is designed to prioritize reusing unused packs over pulling in fresh packs. It should never clog and should always maintain balance as long as enough science packs are being supplied.
Update: Now available in half and full belt in yellow, red or blue versions.
New Version: Here