ISS (Internal Storage System)
Also: ISS2, Internal Storage System
MRS's ISS has an air- and watertight TiZip zipper at the stern. Luggage goes in dry bags straight into the tube.
According to the Packrafting Store, two waterproof dry bags are fixed in the tube, and the rest of the tube volume can also be used. The system adds about 300 g. The ISS2 (MRS Nomad S1) has two TiZips, left and right.
Warning: after the trip a TiZip must dry open and must never stay packed wet for more than 48 hours, or mould and hydrolysis threaten.
Matching gear
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MRS dry bags for ISS* (advertising, external link, opens in a new window)
Sources and further reading
Research as of 13 Nov 2026. We have marked manufacturer information as such.