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Vendor 3F UL GEAR

3F UL Gear Tyvek Bivy Bag (Zip or No Zip)

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Regular price £25.00 GBP
Sale price £25.00 GBP Regular price
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Delivery and Shipping

Free shipping for all orders over £80.

Orders are shipped Monday - Friday before 2PM. All orders are dispatched with 1-2 day shipping, excluding weekends. Cut off time for same-day dispatch is 2PM.

When will I get my item?

We aim to ship orders Monday - Friday with Last cut off being 13:00 on busy days some Mondays might be earlier due to weekend orders.

Deliveries take 1-3 Day with 99% of orders arriving next working day. 

Please be advised orders are not shipped or delivered on public holidays

For Highlands or NI please allow extra time.

3F UL Gear Tyvek Bivy Bag

A light Tyvek cover that slips over a mummy sleeping bag or quilt to keep tent condensation, dirt and light splashes off the bag, and to trap a little extra air for warmth.

Choose Type A without a zip (about 135 g, quilt-friendly) or Type B with a zip (about 200 g, mummy bags). It is water-resistant rather than a full storm shell — use a tent or tarp in heavy rain. See 3F UL Gear.

Key features

  • Breathable Tyvek fabric
  • Protects sleeping bags from condensation and dirt
  • Adds a little insulation by trapping air
  • Zip or no-zip options
  • Compression sack included

Specifications

Type A (no zip, quilt) About 135 g; about 180 × 145 cm; packed about 16 × 8.5 cm
Type B (zip, mummy) About 200 g; about 230 × 90 cm; packed about 16 × 8.5 cm
In the box Bivy + compression sack

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FAQs

Is the Tyvek bivy waterproof?

It is water-resistant and handles condensation and light splashes. In heavy rain, use it under a tent or tarp, or choose a heavier-duty bivy.

Should I choose the zip or no-zip version?

Type B with a zip suits mummy bags and is easier to get in and out of. Type A without a zip is lighter at about 135 g and suits quilts.

Will it make my sleeping bag warmer?

A little — it traps air and blocks draughts, and keeps the bag drier so insulation works better.

Is this a full tent replacement?

No. It is a bivy or footbox layer for extra weather protection with a sleeping bag or under a tarp/tent.