Hydrapak Seeker 2L MammothSeeker 2L is a weight and space saving water reservoir designed and manufactured by Hydrapak from TPU, PP, and Nylon. The bottle has a capacity of 2000lm, weighs only 76g, and is produced from elastic thermoplastic polyurethane. RF welded seams significantly increase the durability of the finished product. Utilized material makes it considerably lighter than solid bottles and enables it to flatten and roll when empty. The additional side handle with