The dimensions of the new i8 phones are very close to the dimensions of the i7. The differences are so small that if you’re rocking a 7 case, you should be good to use the same case for your iPhone 8.
Although the size differences are minor, some hard plastic cases on the market that snap to the iPhone may either be too snug (making it very difficult to put on or remove) or may not fit at all. Hard plastic cases are designed to the exact dimensions of the iPhone and do not flex compared to a rubber-type case.
Luckily, CaseMe offerings for iPhone 7 and 7 Plus are both rubberized and flex just enough to accommodate the difference in size. You can choose the CaseMe iPhone 7 Wallet Case or the CaseMe iPhone 7 Plus Wallet Case for a more expressive geometric design. Both cases are hybrid and do work perfectly with the iPhone 8 and 8 Plus.