Collapsible PVC buckets with a solid fiberglass base. The solid base stops knives and sharp objects from piercing the bucket when you throw them in there. The buckets are available in 3 different sizes. Namely a small, medium and large.Easy to use, easy to clean and because they are collapsible most importantly simple to store anywhere on your kayak. Suitable for use on all types of kayaks. A Must for easy storage and many other benefits while fishing or touring on your kayak.