Accept his gift graciously and understand his sacrifice. If he is anything like my guy; I know the decision to depart with his gear and tools was tough to make. But just say "thank you" and give him a hug; nothing else needs to be said. And if you at some point, don't have the room; don't hesitate to 1) sell the gear/equipment or 2) donate it which I think is a awesome option - you can give your brother the tax writeoff or treat him to something special he will enjoy.