The straps for 38 mm, 40 mm and 41 mm cases work together, and the bands for 42 mm, 44 mm and 45 mm cases work together. Most straps designed for Apple Watch Series 4, Apple Watch Series 5, Apple Watch SE, Apple Watch Series 6, and Apple Watch Series 7 work with any previous version of Apple Watch. Before the Apple event, rumors suggested that the Series 7 would receive a flat redesign, making it no longer compatible with old bands. Fortunately, that's not the case.
Apple barely expanded the dimensions of the watch itself by creating an enveloping effect and a soft-edged design. Apple completely redesigned the Apple Watch Series 7 screen to create more than 50% more screen area than Series 3 and 20% more than Series 6.While previous leaks suggested that older straps will continue to fit the Apple Watch 7, Max Weinbach, from Android Police, speculates that this may not be the case, based on what he's heard from an Apple Store employee. In addition to making it easier to read on the wrist, the new larger screen of the Apple Watch 7 could result in a series of new watch faces. Although it wasn't the redesign that many thought it would be, the Apple Watch Series 7 looks slightly different from last year's model.
Generally, any watch band will be compatible with any Apple Watch, however, there are some differences in which Apple Watch strap you can use depending on whether you've opted for the large or small version of your generation of Apple Watch. If you're an Apple Watch fan, chances are you've invested a lot of money over the years to create your personal strap collection. Since the Apple Watch comes in so many different case sizes, it's no surprise that people feel confused about which of the different watch straps will fit the watch they own. Remember that, since all straps will be compatible with the new Apple Watch, there's no reason to wait for the Apple Watch Series 7 to be released to buy new straps if you're looking for a new look.
Apple watch straps are currently undersold, and both the classic Milanese Loop and the May seasonal straps cannot be purchased at Apple's online stores and retailers. Thanks to its larger screen, the Apple Watch Series 7 will have a full keyboard with QuickPath, a fully optimized user interface and new Watch Faces. When you buy an Apple Watch strap, you may need to specify which watch it's for, big or small, but you can usually buy either bracelet for any of the watches. Another possible explanation is that some straps need a redesign to adapt to new watches and others do not.
After six years of band compatibility, it's hard to complain too much if the seventh-generation Apple Watch mixes things up. The Solo Loop and Traided Solo Loop straps are only compatible with Apple Watch SE and Apple Watch Series 4 or later.