I bought the small size but it is much too small for my purse. It'd probably work great for a very small, narrow purse. I included pictures with a soda can for size reference.

I got this purse to use in Italy. I'd initially bought a larger one, which, when filled, was way too heavy. The larger bag itself was heavy and I overpacked it. Before going I tried out each bag for a week. The first one was uncomfortable just going to the grocery. (I put in it a pair of mini binoculars, a small camera, my wallet, my sunglasses, my checkbook, a small makeup bag with powder and lipstick and a coin purse and my smartphone). When I switched to this one, I could not fit the checkbook and sunglasses -- but realized I would not be bringing the checkbook overseas and so the newer size was fine -- without the checkbook, the sunglasses fit.

I put the binoculars and the camera in the zipper part under the flap. I kept tissues in the visible zipper part (bathrooms don't always have them -- seemed more of a problem in Rome than in Venice...). I also put 3x5 cards with notes and folded pages of the Rick Steves travel guides in that front zippered area (and in Venice, the tickets we used for the boats). The back of the bag also has a zippered pocket that rests against the body -- good for the powder and lipgloss or sunscreen. The top zipper has a loop that holds a mini flashlight -- nice when returning to our room with the hall lights on a timer. The top zipper has a clasp that locks on to the side. I put my sunglasses, phone, wallet and our passports in this main compartment along with the change purse. There are slots for credit cards in the purse but I did not use them. I liked having the added protection of the wallet being at the bottom of the purse.

A few caveats: My wallet is a mini one... it holds 3 cards and ID. The change purse I used was a bit larger and had 3 compartments (a kiss lock bag). I used one for coins, one for dollars and one for euros. The bulk of our money I kept in a hidden waist belt bag (which I never showed in public -- if I needed more, I would excuse myself to the restroom and would transfer money). I kept the credit cards in RFD sleeves and our 4 passports were kept together in an RFD bag. Before leaving I made sure to latch the bag. I always wore it as a cross body bag, not a shoulder bag (though it could be worn that way). It felt more secure, especially in places like the Trevi fountain where it is wall-to-wall people. When we would eat, I generally left the bag on me. FYI -- if you use a smart phone do not set it out on the table like we do in the US. LOTS of tourists shared that people in their tour groups were getting phones taken that way. My phone was either in the locked part of the bag or in my hand when I was using it for directions or Tripadvisor.

Wearing it all day, it did feel heavy. That said, it also felt secure. The chocolate color, while not the prettiest, is nondescript which is really what you want when traveling. You don't want it to catch the eye of a pickpocket. It is also a gender neutral color and so my husband and sons did not mind carrying it if I was taking pictures. It more resembled a camera bag or messenger bag than a purse (and they certainly preferred carrying it to the bright pink tote I also had with me (tote was used ONLY for a scarf, an umbrella, any postcards or trinkets we would buy -- things that if taken could be replaced).