Piglet 843 - If you're concerned about security and don;t want to keep the cash in the house, you may need to be a little more disciplined as you'll be using debit cards or credit cards. How about creating a spreadsheet, or even just use paper and pencil to breakdown how much you have to spend on the 'envelope' categories each month. For example, I would use 1 page per category, note the category and monthly budget at the top. Then, each time you make a purchase in those categories, note the total on the receipt and the remaining budgeted amount. For example, you have a $500 grocery budget. A trip to the grocery store costs you $115. Note the $115, do the subtraction and note that you have $385 left. If you do a running total, are disciplined about writing everything down and don't get carried away with the spending (I find it easier to overspend with my debit card as opposed to using cash) you can do it ! Also, don't forget if you use a credit card to pay for groceries or gas, pay the bill in full when it comes in from the budget $ you have in your account. (Boy, I hope this makes sense !)
Good luck !