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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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Product Description

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 2-5 business days. After you place your order, you will receive a confirmation email with a tracking number and your carrier. This will allow you to track your package and know exactly when it should be delivered.

At this time, we do not offer expedited shipping options, but if you need your delivery expedited, 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.

Returns must be requested within 30 days of purchase date. Items must be in new, unused condition and in their original packaging in order to receive a full refund. If any of these conditions are not met you may not receive a full refund for your return. Customer returns will be refunded to the same card or account that the original payment was made from.

To request a return, please have your order ID available and proceed to the Return Request Portal. Once processed you’ll receive a prepaid shipping label. Print it out, attach to the box, and drop off at your nearest UPS drop point. 

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