Wide mouth bottles are designed for heavy duty storage as well as mixing and sampling. The extra-wide mouth (69 mm inner diameter) gives easier access for pouring and removing pastes, powders, and larger items. They include a linerless, one-piece autoclavable orange polypropylene plug seal GLS 80-threaded cap with a drip-free pouring ring. The neck GL 45-threaded bottles, is much easier to add or remove powders, and to clean.