Sea to Summit Delta Insul-Mug Nylon and they are made to

and they are made to be opened and resealed indefinitely

so it doubles as a compression sack or an inflatable pillow

which bites into rope

our most popular backpack

Simple User Interface

Sea to Summit Delta Insul-Mug Nylon and they are made toThis mug features a groundbreaking advancement in thermal insulation. We use an integrated molded EVA sleeve that actually insulates the liquid inside the mug, unlike double walled mugs which only protect your hands but dont necessarily keep your beverages hot or cold. Well designed leak proof sipping lid has an ergonomic rolled edge and thumb grip with hang loop. Excess liquid flows back into the sipping hole because of the concave design of the lid.