I have been using business size envelopes to file my receipts, but as I have been growing, so have the envelopes. I find my envelopes overflowing and the receipt dates are out of order. What should I upgrade to? I'm tired of dealing with ripped and over-stuffed envelopes. What methods have worked for you guys? I am a full-time solo operation, so I don't have the abundance of paperwork that some of you bigger guys have.