You are using a web browser we don't support. Please use the latest version of one of these browsers.

Mozilla Firefox

Google Chrome

Apple Safari

Microsoft IE

Back to top

Boreas Bolinas 31 Pack

Golden Gate
Golden Gate

This product is no longer available, but don't go just yet.


  • With a simple push at the top and the pull of a strap, the innovative variable suspension transforms from close-fitting stability to off-the-back, trampoline-like ventilation
  • Adjusting the gap between the pack and your back is like adjusting a thermostat—bigger gap, more cooling airflow; smaller gap, more warmth and stability
  • Supportive, ventilated shoulder straps and back panel distribute pressure evenly with resilient foam that maintains its volume, even under a heavy load
  • Aluminum and steel hoop frame effectively transfers load weight to your hips; lightweight webbing hipbelt is removable
  • Water-resistant, roll-top main compartment features a completely waterproof pocket for wallets, phones and other items that run screaming from water
  • Organize often-used items with dual zippered side pockets and a tuck-away daisy chain; hydration sleeve and port enable on-the-go hydration (reservoir sold separately)
  • Lightweight, 210-denier ripstop pack fabric is impregnated with silicone for water-resistant durability that thwarts the tendency to wear out or rub off over time
  • The Boreas Bolinas 31 pack incorporates stretch panels that allow the pack body to expand and curve, depending on the load and suspension setting


View all Boreas Daypacks

REI membership


Best Use Hiking
Frame type Internal
Gear capacity (L) 31 liter
Gear capacity (cu. in.) 1,892 cubic inches
Weight 2 lbs. 4 oz.
Fits torso 17 - 21 inches
Fits waist/hips Up to 44 inches
Material(s) Silicone inpregnated ripstop nylon
Frame material Aluminum/steel hoop
Number of stays 0
Suspended mesh back panel Yes
Pack access Top
Number of exterior pockets 3 + main compartment
Dimensions 22 x 12 x 8 inches
Gender Unisex

The REI Difference

100% satisfaction guaranteed

We stand behind everything we sell. If you are not satisfied with your REI purchase, you can return it for a replacement or refund within one year of purchase.

REI's guarantee doesn't cover ordinary wear and tear or damage caused by improper use or accidents.

If your item has a manufacturing defect in its materials or workmanship, you can return it at any time. See our limited warranty.

Gear & advice you can trust

At REI, we live and breathe the outdoors, and we're passionate about sharing our expertise with people of all skill levels. Whether you're new to the outdoors or a seasoned explorer, we'll take the time to understand your needs and help you find the right gear for you.

10% annual member refund

Anyone can shop at REI, but for a one-time $20 fee you can become an REI member and enjoy a lifetime of benefits. These include an annual member refund, typically 10% back on eligible purchases.*




*10% is typical but not guaranteed. Your refund is based on eligible purchases, which exclude REI gift cards, services, fees, REI Adventures trips,, and discounted items. Learn more