While this is a fully inflatable boat forum, discussions are almost always about SIBs that are designed to be used with outboard motors. Going a little bit outside of the box a bit, there is no reason that this section on about SIBs (Soft Inflatable Boats) cannot include inflatable boats that are designed for paddle or oar propulsion.
Imagine that you launch your motorized inflatable boat on a good sized lake or river and go for several kilometers to a landing spot of your destination. At this landing spot, there is a trail head for an overand portage trail of about 1 kilometer that leads to a smaller lake that is loaded with trout. You want to fish that lake but pulling your SIB for a full kilometer (or more) by it's launching wheels over a boulder strewn portage trail is more daunting of a task than you are prepared for. But, you really
want to fish that lake! - what do you do?
Enter the Alpacka rafts. These are a series of superlightweight (3.25 - 6 lbs) backpackable polyurethane inflatable rafts. Apparently they are remarkably tough and hold up quite well even to usage in whitewater. Here is a link;