I know exactly what you mean. I have a couple bags where this new wristlet is a tight squeeze, especially trying to fit it into the center zip section of the purse, so it won’t work. And it does make the bag heavier. 
I used to pop my previous wristlet in any purse and it served as my wallet or stand alone wristlet, and I liked doing that. I don’t regret getting the double zip but it’s not as transportable and universal as the old one was.
I don’t have the Mercer but would guess that the double zip will not fit, based on my experience with the wristlet. My previous wristlet probably would have because it was thinner and not as big and wide.
I too don’t want to have to keep changing things from wallet to wallet, etc. Lately I’ve been on a handbag and wallet kick to rethink my lifestyle so to speak, to make things easier and simpler for me. I’ve been finding some good deals. A few days ago I ordered what’s called the medium slim wallet from MK that has a little card holder also (a two-piece item) on sale for $41. It’s a very lightweight little slim wallet with a credit card thin insert that can be removed and moved from bag to bag, and also put it in the wristlet easily. I will keep my cards there, then move this thing from purse to wherever. I’ll see how that works out. They are running their Labor Day sale, as are the outlets this weekend. (I see they also have some double zip wallets for around $49!! But not all. Click on the main sale banner to see what is on sale.
I love my bags but sometimes my arm and shoulder will hurt. I try not to carry such heavy weight these days. I have a couple Kors that are are on the heavy side with nothing in them. I see a lot of use for this new little wallet coming my way, not only using it in the heavier bags instead of the wristlet, but on its own and I would carry my phone separately if I want. In fact the whole little wallet is so thin it would fit in a flat wristlet or even a belt bag. The cards, license etc. will stay in the insert and can go from place to place without having to unpack everything if I change to the wristlet.

I used to pop my previous wristlet in any purse and it served as my wallet or stand alone wristlet, and I liked doing that. I don’t regret getting the double zip but it’s not as transportable and universal as the old one was.
I don’t have the Mercer but would guess that the double zip will not fit, based on my experience with the wristlet. My previous wristlet probably would have because it was thinner and not as big and wide.
I too don’t want to have to keep changing things from wallet to wallet, etc. Lately I’ve been on a handbag and wallet kick to rethink my lifestyle so to speak, to make things easier and simpler for me. I’ve been finding some good deals. A few days ago I ordered what’s called the medium slim wallet from MK that has a little card holder also (a two-piece item) on sale for $41. It’s a very lightweight little slim wallet with a credit card thin insert that can be removed and moved from bag to bag, and also put it in the wristlet easily. I will keep my cards there, then move this thing from purse to wherever. I’ll see how that works out. They are running their Labor Day sale, as are the outlets this weekend. (I see they also have some double zip wallets for around $49!! But not all. Click on the main sale banner to see what is on sale.
I love my bags but sometimes my arm and shoulder will hurt. I try not to carry such heavy weight these days. I have a couple Kors that are are on the heavy side with nothing in them. I see a lot of use for this new little wallet coming my way, not only using it in the heavier bags instead of the wristlet, but on its own and I would carry my phone separately if I want. In fact the whole little wallet is so thin it would fit in a flat wristlet or even a belt bag. The cards, license etc. will stay in the insert and can go from place to place without having to unpack everything if I change to the wristlet.
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