100 Envelopes Money Saving Binder The 7.9'x7.9' size 100 envelope challenge binder can make it fun to dedicate more cash to savings. Using envelopes labeled 1 to 100, you could set aside $5,050 over 100 days. Premium Material Storage binder cover is made of soft and durable leather, and the inner pages are composed of waterproof and transparent PVC material, which makes it durable and can be reused. Portability and Convenience 100 days challenge book is sized so you can carry it around with you, and the rich combination of accessories will allow you to complete a record anywhere, anytime Savings Binder Follow it, you'll have set aside a hefty amount in a relatively short period of time. Think of the 100-envelope challenge as a stepping stone in a lifelong savings journey. Keep Your Budget Organized You could use your savings from this challenge to start your emergency fund, as the start for a large financial goal, like a home down payment, kid's college fund.