Great size, easily fits a Pixel 4 XL with a case. Snuggly fits a Pixel 4XL in a slim case and a second 5" cellphone in a slim case. There is still space for small objects in the card slot on the front of the phone compartment even with the two phones. Material: The top and back are the same tarp materials that the prior Phone pouches from Chrome are made of, the sides are an elastic strip. I have ridden for hours in torrential rains with the prior phone pouches on the front strap of a Citizen Metro Bag and have never experienced any water getting into the phone pouch. I'm not as confident of the elastic having the same water resistance due to the sides being the elastic strip. The construction is solid, just like the last two phone pouches I've bought from Chrome. Those pouches continue to be in good shape, they just are too small for the largest phones on the market today.