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Travel Backpacks Core Pack 35L Performance Adventure Backpack

Core Pack 35L Performance Adventure Backpack

Rocky Mountain Underground

  • Sale
  • Regular price $249.00

Key Product Features

  • True adventure backpack made for long hikes, backpacking, and getting off the beaten trail.
  • Solidly built and extra durable to handle everything that gets thrown at it.
  • 35 Liters of organized space to get all of your gear to your next destination.

Customer Reviews

Based on 1 review
Go Anywhere

Amazing hiking and adventuring pack. Took this bag on a back-country ski trip and couldn't have been happier. Rugged, spacious, organized, and comfortable to carry all day.

Core Pack 35L Performance Adventure Backpack

Built for any environment, with all the features of a rugged outdoor bag in a sleek design, the RMU Core Pack Performance Adventure Backpack will have your back for all of your adventures. Hit the trails, slopes, mountains, or streets with an adventure backpack that has it all. Built with highly durable weatherproof nylon fabric, a structure back panel for weight distribution and breathability, and padded shoulder straps combine for a comfortable carry. 35 liters provides packing space for a weekend adventure with multiple external anchor points and straps for additional gear. This hiking backpack is solidly built and a single solution for anyone looking for a travel backpack that can do it all.



  • Weatherproof 630D nylon fabric with polyurethane coating.
  • Exterior panel to stash wet gear/ clothes.
  • Multiple internal organization pockets.
  • Exterior top side fleece lined pocket for sunglasses.
  • Comfortably fits in an overhead bin.
  • Waist belt and sternum strap.
  • Large front side quick access pocket.
  • 2 side compression straps, 1 front compression strap.
  • Front side elasticized sling offers additional external storage and hides in the front panel when not in use. Great for strapping a light jacket or shoes to the outside of the bag.
  • Full height back panel zipper for easy access to the main compartment.
  • Top and bottom grab handles.


Free domestic shipping for all orders over $49.

Depending on the product and availability, your order should ship in 2-5 business days. You will receive a confirmation email with a tracking number and the carrier when your order ships so you can track your package and know exactly when to expect it. Average transit time is 3-5 business days.

We do not offer expedited shipping, but if you need your delivery rushed please contact us at and we will attempt to expedite your order.

Currently we do not ship internationally.

If you bought multiple items they might ship separately.


If you are not happy with your purchase for any reason in the first 30 days, contact us at and we'll help you initiate a return.

Please note that items must be unused with the original packaging intact in order to receive a refund. Refunds will only be processed after the item is received and its condition is verified.

Return shipping is the responsibility of the purchaser.

Our Shipping & Returns page has all of the details.

Our Promise

We want to make sure you’re happy with your product, your purchase, and everything in between. We hope you’ll love every product you buy from Flashpacker Co but understand sometimes things go wrong. When that happens we’ll do everything we can to make it right.

Check out our Satisfaction Guarantee page for the full details.


Rocky Mountain Underground


Rocky Mountain Underground

RMU started with humble beginnings building skis for friends in their basement. Word got out about their high quality and innovative designs and before they knew it everyone was looking for RMU skis. RMU has grown into a reputable ski and snowboard manufacturer building exceptionally high quality and sustainable products. Their skis are still produced by hand with a low waste and high durability emphasis in every product.

This commitment to quality extends to Rocky Mountain Underground bags and gear. Every bag is uniquely designed to keep you moving and enjoying the outdoors. We love the exceptional quality and innovative designs that go into every RMU bag. When you need reliable gear for outdoor adventures, look no further than Rocky Mountain Underground.

Product Warranty

Every Rocky Mountain Underground bag is backed by a lifetime warranty against defects in manufacturing.

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