The e-ticket it intended to be used as one complete piece of paper. When I first visited after they developed the new e-tickets, I questioned the logic of having to carry a piece of paper for seven days. This was before I learned to print off multiple copies before I left home. The park's representative told me I only needed the bar code/ticket number and the visitor's name to be intact. What I've done is fold my e-ticket so that the bar code is visible and place it in a small zip-loc bag...the snack sized ones. I can keep the ticket dry and safe, and I can scan the bar code through the bag. I've never had to open the bag. In subsequent visits I've printed multiple copies just to be safe, also.
As an editorial note, I think it's silly that they expect you to use a paper ticket for a seven (or in some cases 14) day visit. Before last year they would let you trade your e-ticket for a very thin plastic card that could be easily caried in a wallet. You could even do this at the computer kiosks outside the park, so no employee was needed. When I first questioned this at Busch Gardens, the representative said I couldn't get a card any more, and that I had to use only the paper ticket. When I gently pushed for a card, she said "Mr. Busch believe in saving the environment, so we can't give out cards anymore." I thought that was a dumb excuse. I should have asked her how it fits into "Mr. Busch's plan" to sell muli-thousands of kids meals in industrial strength plastic boxes. I hate when companies give bogus excuses and think customers are stupid enough to be so easily placated. End of editorial.