I already own a breathable bivy, but it is too heavy for my intended uses this summer.
I will be doing both backpacking and sea kayaking expeditions on Vancouver Island (the backpacking parts will be the Nootka and/or the West Coast Trail and the North Coast Trail (if it reopens–it’s currently closed because of storm damage).
I will also be doing some trips in less rainy places (such as Hells Canyon on the border of Idaho and Oregon, and maybe a trip into the greater Yellowstone area or Wind River).
A tarp/bivy combo is what I’m planning. My main considerations for this bivy are plenty of room inside the bivy and a bathtub ring (or other good, waterproof floor surface) to keep water out if I’m in a torrential downpour (fairly likely at some point given the amount of time I’ll spend on Vancouver Island this summer).
I like some of the ID bivys, but they are too heavy (unless there’s a lighter weight version I’ve missed).
The two I’m currently considering are the MLD Superlight and the BPL Vapr. Both are in the 5-6 oz. range. My concern with the BPL bivy is that it might not have enough space inside to move around, and for plenty of loft in sleeping layers.
Any experiences (or thoughts) on this category of bivys would be greatly appreciated.
Edited for links

