Buying 2 will save your money. Our XL crate is made from 1 x Flexi crate & 1 x Standard size crates if kiln dried birch hardwoods. Birch logs are EU standard size, 25cm in length and 7-15cm wide measured across the widest edge. Excellent for all wood burning appliances. Hardwoods are ready to burn to highest standards, average 8-16 % MC, Woodsure / Hetas accredited.