The Mi Band 6's body is identical in size to the Mi Band 5 - it's the same tiny piece of plastic and with tempered glass atop the screen. The size and weight remain pretty much the same - 47.4 x 18.6 x 12.7 mm and 12.8 grams (vs. 46.95 x 18.15 x 12.45 mm and 12 grams). And that's great news for two reasons - the new features didn't make the Mi Band bigger, and all straps you bought for your Mi Band 5 are compatible with the Mi Band 6.