For at least a month, try the basically-free method of using standard white mailing envelopes (or any of the other cheap DIY cash envelope organizers). Label each envelope with a budget category, stuff them with cash, and put them in your purse. If you stick to this system for a month or more, and find that it is helping you curb your spending and stay within budget, then invest in a special cash envelope wallet.
I just received my purse today and am so pleased! It just wanted. It has met my expectations and more! My old purse is the black one; the new purse is the brown one. The new one is much better. It hold my iPhone 8 Plus easily and has more space for cards and such. Plus, I like that it holds a pen (I am always scrambling for a pen) and a passport, checkbook, money or whatever extra little items you have. I give an A++ https://i.pinimg.com/236x/ff/e7/37/ffe737f270789202e07e75ae47327a54--travel-accessories-laptop.jpg