"players will also need to spend a new VOUCHER token for each Chaos Legion presale pack they wish to purchase. 33,333.333 VOUCHER tokens will be created daily over the course of the 30 presale period (1M VOUCHER tokens in total)"
So:

• you need vouchers to BUY presale packs not to open them
• there will be 1M VOUCHER tokens in total and 1M CL packs at presale