Fill the bucket up about 1/3 with water, toss a towel over the top to keep the fish from jumping out. 70 minutes is nothing for a transport, fish in your local shop go 24-48 hours bagged. I regularly buy & sell fish at auctions & swaps, 12-24 hours poses no problems for tropical fish when bagged properly. Buckets and styros are a commonly used item for larger fish, they do just fine for many hours this way.