The Sea to Summit Lightweight Dry Bag First Aid is a 1 L roll-top dry bag purpose-built for a first aid kit, made from bluesign-certified recycled 70D nylon with a 10,000 mm hydrostatic head rating. At 32 g it adds almost nothing to pack weight while keeping bandages, medication and other contents dry and organised as one identifiable unit.
The white PU interior serves the same purpose as in Sea to Summit's other Lightweight Dry Bags: contents are visible at a glance in low light, which matters more for a first aid bag than most gear — in an actual emergency, fumbling through a dark bag costs time. An oval base keeps the bag from rolling off a flat surface, and a D-ring gives a fixed attachment point for clipping it inside a pack lid so it stays in the same place every trip.
The Hypalon roll-top closure is a more rugged material than the fabric on the standard Lightweight range, reflecting that a first aid bag tends to be opened under stress rather than casually.