Design: The mug is primarily blue and features a surface compatible with various building block systems, including LEGO, PixelBlocks, Mega Bloks, KRE-O, and K’NEX. 

Customization: Users can attach their favorite building blocks to the exterior of the mug, creating unique designs and patterns. 

Material and Capacity: Made from food-grade, non-toxic plastic, the mug typically has a capacity of around 350ml. 

Usage Notes: It can withstand temperatures up to 100 degrees Celsius, but it is not suitable for microwave or dishwasher use. 

Included Accessories: Often, a small starter pack of building blocks is included with the mug. 

Purpose: It serves as a functional drinking vessel while also offering an interactive and creative element, making it a popular gift item.