Bamboo Silicone Travel Bowl Cup is made of durable, non-porous materials. The special collapsible design folds down to less than 1/2” – ideal for travel, parks and walks! Fits right in your back pocket or toss it right into your bag! 1 cup (8 oz.) is ideal for small or medium size dogs & 3 cup (24 oz.) is big enough for large size dogs.