We got 2 sets and switched out discs so everyone had multicolored bands. Then I lost one of mine, and was glad I had a spare band. Over the years DH has lost one of the last gen bands and I lost one of the new ones. Fell off while walking between HS and BCV. We have declined bands in the past, but usually bring 2 for each person just in case. The "extra" bands are packed separately.