Bibs are a necessary expense for races. Choices include plain paper bibs, bibs with sponsors, or fancy fabric bibs. But for low cost, nothing beats free, and RoadID.com will provide free bibs with their logo on them.
While the RoadID bibs are a little on the small side, they are perfectly suitable for cross races; just have racers remove the tear-off strip so they don’t fold over and cover the numbers. Another advantage of the free RoadID.com bibs is that the sponsor logos make it easy to determine if a bib is upside down. With blank bibs, numbers like 68 can be pinned upside to produce a different number.
Having a sponsor name on the bib provides that extra information needed to keep bibs on the right way.