Louie Waist Pack has an add-on! That's right, you can now add card slots with tried and true instructions. I have avoided adding any bulk to the seam allowances with my method that maintains the favorite features of the waist pack.
Love the Bailey Backpack, but really don't want two straps? Let me show you how to convert it to a Sling Pack! You'll need a pattern piece to get started, and then I'll take you step by step through the process.