Best picnic blankets: large, waterproof, cool picnic blankets
G GOOD GAIN Picnic Blanket Waterproof & Sand Proof,Beach Blanket Portable with Carry Strap, XL Large Foldable Picnic Rug Machine Washable for Outdoor Camping Party,Wet Grass,Hiking,Kids Playground : Amazon.co.uk: Garden
Dusky Pink Waterproof Picnic Blanket with Straps – The British Blanket Company