Out of Stock

Sierra Designs Flex Capacitor 60L-80L Trekking Backpack

Reviews loading...

Hurry up! Sales Ends In

Hurry! Only 0 Left in Stock!

Order in the next hours minutes to get it by
More Delivery Options
Spend £30.00 for Free Shipping
Delivery Options


 The lightweight backpack of your dreams is here. Meet the versatile pack that hauls it all. The Flex Capacitors is a beast of backpacking pack, constructed from durable nylon for rough conditions in the backwoods and built with adjustability in mind. Loosen the expanding horizontal gussets for an additional 15-20L of cargo capacity on longer backpacking trips, or cinch it tight for smaller, compact loads on fast summit days. Plus, ample quick-stash solutions on the straps, sides and bucket lid ensure there are plenty of places to store your mid- trail essentials. However, you pack it, the Y-Flex suspension adds support so this lightweight backpacking backpack can hit well above its weight class.

  • Expandable volume: 60L - 80L
  • Lightweight 'Y' Flex suspension
  • 20L adjustable volume to tailor both to extended backpacking trips or shorter day trips.
  • 2 Stretch mesh side pockets
  • 2 Stretch hydration pockets on shoulder straps
  • 2 large zippered pockets on waist belt
  • U-shaped top zippered access
  • Zip stash pocket in lid
  • Capacity: 60-80L / 3661-4882 in3
  • Weight (with M/L waist belt): 3 lbs 2 oz / 1.40 kg
  • Torso Fit: 18" - 21" / 46 - 53 cm
  • Hip Fit with M/L waist belt: 33" - 48" / 84 - 122 cm
  • Dimensions (H x W x D): 27.5" x 8.5" x 12" / 70 x 22 x 30.5 cm
  • Suspension: Lightweight 'Y' Flex 

  • Delivery Options

      Standard Delivery

    Free Delivery on orders over £30 and £2.95 for orders under £30.

    • Delivery is within 2-4 working days, ordered before 1pm
    • Your order will be delivered by Royal Mail or UK preferred Courier
    • You will be notified when your order is despatched

      Express Delivery

    Free Delivery on Orders over £500, £5.95 for orders under £500

    • Delivery is within 1-2 working days, if ordered before 1pm
    • All orders over £500 are eligible for free Express Delivery service
    • A delivery charge of £5.95 applies to purchases under £500
    • Please be aware we only deliver to UK Mainland and Northern Ireland
    • You will be notified when your order is despatched


    **Please note we only deliver to the UK and Northern Ireland. We cannot take responsibility for any delivery delays or problems out-with our control caused by the weather or any Delivery company. We will do everything we can to help resolve any delivery issues. You will be responsible for the items as soon as they are delivered. If you wish to cancel an order before it has been dispatched, you should call us on 0131 3807205, or email us at:


      Returns Policy

      Thank you for making a purchase with us at PureMtn.

      If you've changed your mind for any reason about the product you ordered, please contact us with your order number at and we will then provide you with a Returns Number and start your returns process of how and where to send the item/items back to us.

      Provided your item is unused and in original condition within 31 days of order (including all labels, tags, product boxes, accessories and bags intact), you can send the item/items back for a refund or exchange. Please ensure all Returns are carefully packaged as they may be refused if items arrive damaged due to improper packaging.

      If a Refund is requested, we will refund the value of the returned goods (not including the postage) to your original payment method within 7 days after they have been received and checked by our returns team.

      Should, for some reason, you receive a damaged or an incorrect item, then please accept our apologies and contact our Customer Service Team immediately on Tel: 0131 380 7205 to allow us to resolve the problem as quickly as possible.

      Please don’t hesitate to contact our Customer Services team on 0131 380 720 if you have any questions about our returns policy. They are here to help you Monday - Saturday 9.30am - 5pm or email us on:


      Should you choose to return your order and request an exchange, the exchange  will be sent the day after your return has been checked and logged, provided the requested exchange item is in-stock. You will be charged for any additional postage. To ensure you get the item you wish, it will be quicker and simpler to order the new item and send the old one back as a return and request a refund.

      You will receive a refund for any difference in price, if a lower value item has been chosen in exchange (minus the cost of any original shipping charge.

      Sierra Designs Flex Capacitor 60L-80L Trekking Backpack

      Sierra Designs Flex Capacitor 60L-80L Trekking Backpack

      Reviews loading...