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Expandable 35L Travel Backpack

Expandable 35L Travel Backpack

Rocky Mountain Underground

  • Sale
  • Regular price $249.00

Key Product Features

  • The ultimate all in one, single bag travel solution for any adventure, on or off road.
  • One of the most versatile travel backpacks available thanks to multiple organization features & 2 ways to carry.
  • Expandable storage takes you from 35 to 50 liters so you can use this bag on trips of any duration.

See The Expandable 35L Travel Backpack In Action

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Expandable 35L Travel Backpack

Adventure knows no bounds with the RMU Expandable Travel Backpack. The all in one single bag travel solution can do it all. Made from premium materials designed to withstand the elements on the toughest treks or alpine adventures. The highly durable TPU coated material is extra tough and weatherproof. 35L of packable space offers plenty of room for a weeklong trip while still fitting in an overhead bin. When in need of additional space, this backpack expands all the way up to 50L of total space. The interior is loaded with organization features including sidewall pockets, a removable compression strap, and false bottom to hide valuables. Store your gear confidently with a padded laptop sleeve, storage dividers, and a stashable elasticized sling on the outside for shoes or a light jacket. This unique expandable backpack will keep you organized on trips of any length, last a lifetime thanks to the premium material and construction, and look awesome the whole time.



  • 2 ways to carry; briefcase style via the grab handle with the shoulder straps stashed or on your back.
  • Premium materials include TPU coated weatherproof external, 150D polyester liner, and aluminum hardware.
  • Accordion style expansion from 35 to 50 liters so it can be used on trips of any length.
  • Multiple internal pockets, storage divider, false bottom for hiding valuables, and padded laptop sleeve to keep you organized.
  • External small zipped pocket.
  • Front side elasticized sling offers additional external storage and tucks away when not in use. Great for strapping a light jacket or extra shoes to the outside of the bag.
  • Stash the shoulder straps in the back panel to check it or carry as a briefcase.



  • Green: Canvas with polyurethane coating, 150D polyester liner.
  • Black: 630D TPU coated nylon, 150D polyester liner.



  • 22” H x 15” W x 5” D | Volume 35 liters
  • Expanded: 22” H x 15” W x 8” D | Volume: 50 liters


Free domestic shipping for all orders over $15!

Depending on the product and availability, your order should ship in 1-2 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 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’re unhappy with a product purchased from our store for any reason, return it within 30 days of purchase, no questions asked. We’ll even cover the return shipping.

Our Shipping & Returns page has all of the details.

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Check out our Satisfaction Guarantee page for the full details.

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