Sierra Designs 40-60L Flex Capacitor Backpack , Pack Type: Overnight Pack w/ Free Shipping — 4 models

10 imagesSierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
03:08
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
1 of 1 videos
Sierra Designs Flex Capacitor Pack Product Video
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
1 of 10 images
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
2 of 10 images
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
3 of 10 images
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
4 of 10 images
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
5 of 10 images
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
6 of 10 images
Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
7 of 10 images
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
8 of 10 images
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
9 of 10 images
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M
10 of 10 images
Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M

Tap Tap to Zoom

30% Off Almost Everything Full-Pri
On Sale
Bonus Rewards

30% Off Almost Everything Full-Price

See promotion details.
TGVEClick to Copy Coupon Code
Eligible models will have a savings offer and the coupon code to use below. Add the item to your cart and enter coupon code for savings on that select model! Limited time only. Cannot be combined with other promotions or offers.
Detailed Model List
In Stock
4 Models Available

Show with deals only:

Coupon Available
On Sale
Bonus Rewards
$183.96 - $229.95
Select Size
Medium - LargeSmall - Medium
Select Hipbelt Size
16 - 19 in18 - 21 in
Select Color
Select a product variant
Select a product variant
Please select parameters

Product Info for Sierra Designs 40-60L Flex Capacitor Backpack

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. Flex Capacitor Rain Cover sold separately.image

Specifications for Sierra Designs 40-60L Flex Capacitor Backpack:

Manufacturer: Sierra Designs
Gender: Unisex
Maximum Loading Weight: 50 lb
Weight: 2.72 lb
Pack Application: Backpacking
Pack Type: Overnight Pack
Capacity: 2442-3661 cu / 40-60 L
Pack Volume: 40 - 60 liters
Body Material: 100D Nylon Honey Comb
Hydration Compatible: Yes - Bladder Not Included
Fabric/Material: 420D Oxford
Age Group: Adults
Pockets: Zippered Pockets
Backpack Footprint: No
Pack Loading: Top
Width: 12.5 in
Depth/Thickness: 12.5 in
Minimum Weight: 35 lb
Height: 25 in

Features of Sierra Designs 40-60L Flex Capacitor Backpack

  • Lightweight Y-Flex Suspension provides superior increased support
  • 20L adjustable volume to tailor both to extended backpacking trips or shorter day trips
  • Hydration sleeve doubles as removable summit sack
  • Dual adjusting shoulder straps tailors pack fit to your torso
  • 2 hydration pockets on shoulder straps
  • 2 stretch mesh side pockets to keep essentials close at hand
  • Zippered hip belt pockets for easy storage
  • U-shaped top access zipper for easy access while backpacking
  • Lightweight backpack

Package Contents:

  • Sierra Designs 40-60L Flex Capacitor Backpack
Customer Reviews for Sierra Designs 40-60L Flex Capacitor Backpack Read All (8)
Helpful Positive Review

Well designed, Well made

by Uncle Eddie, from AR, United States Updated on December 22, 2023
I only have a few miles on this pack but I can tell that it can handle it all. I loaded it heavy for a two night camp with my grandson and it was very comfortable. We didn’t go very far but I felt that I could have gone all day! I liked that I could expand it and then clench the load up tight.
Pros:
  • None
Cons:
  • None
Would recommend: Yes
1 of 1 people found the following review helpful.
Permalink
Helpful Positive Review

Great backpack!

by Gennadiy, Verified Owner from DE, United States Updated on September 28, 2022
I have not been a fan of top loading packs and purchased this pack because of its weight and my experience with other Sierra Design products. I took this pack out for its first trip on the Timberline Trail in late October. We had early snow at some of the lower levels and I was happy to have a lighter pack than I usually carry and pleased with my contents staying dry. I also fo...
Read more
Would recommend: Yes
3 of 3 people found the following review helpful.
Permalink
Most Recent Reviews

New backpack preview

by ser, Verified Owner from DE, United States Updated on September 10, 2025
The suspension system works well and feels comfortable with all my gear. Pockets everywhere allowing gear to be organized. The stretch mesh back pockets are good for dry clothes or putting snacks.
Would recommend: Yes
Permalink
Most Recent Reviews

Sierra Designs 40-60

by Andrii, from DE, United States Updated on February 26, 2025
I bought this pack for winter backpacking qnd I have only used it once for a long day hike. I had everything packed for an overnight in the White Mountains of New Hampshire in October where it was expected to be qbout 35 F overnight. The total weight of the pack was 32 pounds and it felt very comfortable when I set it up. My partner couldn't make it, so I removed some of the ov...
Read more
Would recommend: Yes
Permalink
Most Recent Reviews

Great Product! Seller was very helpful

by ser, from DE, United States Updated on February 26, 2025
Love the product! I also wants to give props to the seller. I had some questions relating to my order and they got back to me very quickly and were extremely helpful!
Would recommend: Yes
Permalink
Most Recent Reviews

Flex Capacitor

by rob, Verified Owner from CA, United States Updated on May 11, 2022
I really liked this pack, but unfortunately it did not fit me well so I had to return it. It is a good looking pack and it seem very well constructed. Most importantly I like the fact that the bear canister easily fit sideways in the top. I also like the pockets on the shoulder straps. The only thing I did not like was that the pack at the bottom of the pack seemed to ru...
Read more
Would recommend: Yes
Permalink
Questions & Answers for Sierra Designs 40-60L Flex Capacitor Backpack No Questions Asked Yet

Sierra Designs 40-60L Flex Capacitor Backpack Orderable Models

List of Orderable Models

  • Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Medium/Large, 80710223MJB-M/L , MPN: 80710223MJB-M/L , UPC: 054003857482 , Code: Z58-BP0-SID0488-80710223MJB-M-L
  • Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Medium/Large, 80710223PT-M/L , MPN: 80710223PT-M/L , UPC: 054003854344 , Code: Z58-BP0-SID0488-80710223PT-M-L
  • Sierra Designs 40-60L Flex Capacitor Backpack, Majolica Blue, Small/Medium, 80710223MJB-S/M , MPN: 80710223MJB-S/M , UPC: 054003857475 , Code: Z58-BP0-SID0488-80710223MJB-S-M
  • Sierra Designs Flex Capacitor Packs 40-60 L, Peat, Small/Medium, 80710223PT-S/M , MPN: 80710223PT-S/M , UPC: 054003854320 , Code: Z58-BP0-SID0488-80710223PT-S-M

Sierra Designs 40-60L Flex Capacitor Backpack Unavailable & Discontinued Models

List of Unorderable Models

  • Sierra Designs Flex Capacitor Pack 40-60 L, Peat, Medium/Large Pack Size with Small/Medium Waist Size, 80710220PT2-M/L , MPN: 80710220PT2-M/L , UPC: 054003819534 , Code: Z58-BP0-SID0488-80710220PT2-M-L
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, M/L-S/M , MPN: 80710216GY2-M/L , UPC: 054003797917 , Code: Z58-BP0-SID0488-389339
  • Sierra Designs Flex Capacitor Pack 40-60 L, Birch, Medium/Large Pack Size with Small/Medium Waist Size, 80710220BIR2-M/L , MPN: 80710220BIR2-M/L , UPC: 054003819558 , Code: Z58-BP0-SID0488-80710220BIR2-M-L
  • Sierra Designs Flex Capacitor Pack 40-60 L, Peat, Medium/Large Pack Size with Medium/Large Waist Size, 80710220PT3-M/L , MPN: 80710220PT3-M/L , UPC: 054003819541 , Code: Z58-BP0-SID0488-80710220PT3-M-L
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, M/L-XS/S , MPN: 80710216GY1-M/L , UPC: 054003797900 , Code: Z58-BP0-SID0488-389338
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, M/L , MPN: 80710216GY-M/L , UPC: 054003789967 , Code: Z58-BP0-SID0488-357119
  • Sierra Designs Flex Capacitor Packs 40-60 L, Butterscotch, Medium/Large, 80710223BUS-M/L , MPN: 80710223BUS-M/L , UPC: 054003854351 , Code: Z58-BP0-SID0488-80710223BUS-M-L
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, 418176 , MPN: sid0488-jet grey-m/l-m/l , Code: Z58-BP0-SID0488-418176
  • Sierra Designs Flex Capacitor Pack 40-60 L, Birch, Medium/Large Pack Size with Medium/Large Waist Size, 80710220BIR3-M/L , MPN: 80710220BIR3-M/L , UPC: 054003819565 , Code: Z58-BP0-SID0488-80710220BIR3-M-L
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, M/L-L/XL , MPN: 80710216GY4-M/L , UPC: 054003797924 , Code: Z58-BP0-SID0488-389340
  • Sierra Designs Flex Capacitor Pack 40-60 L, Peat, Small/Medium Pack Size with Small/Medium Waist Size, 80710220PT2-S/M , MPN: 80710220PT2-S/M , UPC: 054003819497 , Code: Z58-BP0-SID0488-80710220PT2-S-M
  • Sierra Designs Flex Capacitor Packs 40-60 L, Butterscotch, Small/Medium, 80710223BUS-S/M , MPN: 80710223BUS-S/M , UPC: 054003854337 , Code: Z58-BP0-SID0488-80710223BUS-S-M
  • Sierra Designs Flex Capacitor Pack, 40-60 L, Jet Grey, S/M , MPN: 80710216GY-S/M , UPC: 054003789950 , Code: Z58-BP0-SID0488-357117
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, S/M-L/XL , MPN: 80710216GY4-S/M , UPC: 054003797894 , Code: Z58-BP0-SID0488-389337
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, 418174 , MPN: sid0488-jet grey-s/m-s/m , Code: Z58-BP0-SID0488-418174
  • Sierra Designs Flex Capacitor Pack 40-60 L, Birch, Small/Medium Pack Size with Small/Medium Waist Size, 80710220BIR2-S/M , MPN: 80710220BIR2-S/M , UPC: 054003819510 , Code: Z58-BP0-SID0488-80710220BIR2-S-M
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, S/M-XS/S , MPN: 80710216GY1-S/M , UPC: 054003797870 , Code: Z58-BP0-SID0488-389335
  • Sierra Designs Flex Capacitor Pack 40-60 L, Peat, Small/Medium Pack Size with Medium/Large Waist Size, 80710220PT3-S/M , MPN: 80710220PT3-S/M , UPC: 054003819503 , Code: Z58-BP0-SID0488-80710220PT3-S-M
  • Sierra Designs Flex Capacitor Pack 40-60 L, Birch, Small/Medium Pack Size with Medium/Large Waist Size, 80710220BIR3-S/M , MPN: 80710220BIR3-S/M , UPC: 054003819527 , Code: Z58-BP0-SID0488-80710220BIR3-S-M
  • Sierra Designs Flex Capacitor Pack 40-60 L, Jet Grey, S/M-M/L , MPN: 80710216GY3-S/M , UPC: 054003797887 , Code: Z58-BP0-SID0488-389336
Compare (0)
1 item has been added
Add at least two items to compare