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BPL Listing ID: 2026-01-28 04:08:13 UTC / 03f0b284bf
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Mountain Laurel Designs ProVent FKT Bivy
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Shelters › Bivy SacksMountain Laurel Designs
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Member Gear Review Summary (1 rating)
Would you recommend it?PRS
7.0/10
n=1
Does it perform as expected?FPS
7.0/10
n=1
Will you keep and use it?RUI
8.0/10
n=1
Mountain Laurel Designs FKT ProVent UL BIVY
See it at Mountain Laurel Designs
Ultralight waterproof-breathable bivy sack using 2.5-layer ProVent UL 10D fabric upper with 1.35 oz 20D Pro SilPoly or 0.8 DCF floor, mummy shape with large-volume head area, pad-accommodating foot box, hang loops, and #3 YKK water-resistant chest zipper; medium weights from 5.6–7.3 oz (160–204 g).
I picked up one of the new MLD ProVent FKT bivies this winter. (For context/comparison, I have > 200 nights in two older-style MLD eVent Soul bivies over the past 10+ years.)
The reason I purchased this bivy sack was sizing – I wanted something that was large enough to accommodate a CCF pad + 3.5-inch inflatable + a winter sleeping bag. I opted for the XL size. It accommodates this stack well, with no sleeping bag loft compression (at least when using my 10 °F FF Lark.)
I have limited experience with this bivy so far, and will update my review here as I spend more time in it. In winter temps (nights of 0 °F to 20 °F), condensation is what I expect – a bit of frost on the inside. Similar to just about every other bivy I’ve used in these conditions.
In moderate temps (25 °F to 35 °F), I experience more condensation with the ProVent fabric than I did with MLD’s eVent fabric. Paper specs of MVTR of “ProVent” seem optimistic – but the actual field performance didn’t meet my expectations when compared to eVent. Kind of a bummer, but not a deal-breaker, as the breathability is certainly good enough for my needs.
I haven’t used the bivy in warmer temps yet.
Disclosures
Obtained independently: I paid for this product or received it as a personal gift from someone not affiliated with the brand.
Backpacking Light affiliation: I work for Backpacking Light in a paid or official capacity (owner/shareholder, employee, contractor, or paid contributor), but I am posting this review as an independent user and its content was not reviewed or directed by others at Backpacking Light.
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