Sierra Designs
Flex Capacitor 40-60L Backpack Hire
- R 3.8 (3-season)
£20 / 5 days hire
Costs £200 to buy. Hire it and you save £180
- Delivered on day one of your hire, anywhere in mainland UK
- No deposit. A temporary card hold, released on return
- Cleaned and checked after every hire
Specifications
| Capacity | 40–60L (20L adjustable) |
|---|---|
| Packed weight (S/M) | 1.23kg |
| Packed weight (M/L) | 1.4kg |
| Pack size (S/M) | 63cm x 20cm x 32cm (H x W x D) |
| Pack size (M/L) | 70cm x 22cm x 32cm (H x W x D) |
| Torso fit (S/M) | 41–48cm (16–19in) |
| Torso fit (M/L) | 46–53cm (18–21in) |
| Frame | DAC alloy Y-Flex stay |
| Body fabric | 100D nylon-poly ripstop |
| Base fabric | 420D nylon oxford |
| Access | Top load, U-shaped zipped lid |
| Pockets | 2 stretch mesh side, 2 stretch mesh shoulder strap, 2 zipped hipbelt, 1 lid stash |
| Compression | 4 volume gusset straps, 2 horizontal compression straps |
| Sizes available | S/M, M/L |
Sizing guide
The Flex Capacitor comes in two fixed back lengths. There is no adjustable back system, so the size you pick has to match your body. Two measurements decide it: your torso length, and the measurement around the top of your hip bones.
How to measure your torso
- Tilt your head forward and find the bony bump at the base of your neck. That is the top of the measurement.
- Put your hands on your hips with your thumbs pointing backwards, so your thumbs meet at your spine. That point, level with the top of your hip bones, is the bottom of the measurement.
- Have someone run a tape measure down your spine between those two points, following the curve of your back. That figure is your torso length.
How to measure for the hipbelt
Measure around your body at the top of your hip bones, not around your trouser waist. The belt sits on the shelf of your hips and carries most of the load, so this is the measurement that matters, not your trouser size.
Sizes
| Size | Torso length | Hip measurement | Weight | Pack size |
|---|---|---|---|---|
| S/M | 41–48cm (16–19in) |
74–81cm (29–32in) |
1.23kg | 63 x 20 x 32cm |
| M/L | 46–53cm (18–21in) |
81–89cm (32–35in) |
1.4kg | 70 x 22 x 32cm |
Between sizes?
The two sizes overlap at 46–48cm (18–19in) of torso length. If you fall in that band, either will carry, and the S/M usually feels more stable with lighter loads. If your torso points one way and your hip measurement the other, size on the torso: a belt at the edge of its range can still be cinched in or let out, but a back length that is wrong puts weight on your shoulders for the whole trip.
If you are unsure, send us your two measurements before you book and we will tell you which one fits. If neither does, we would rather say so than send you out with the wrong size.
Delivery and returns
Your hire equipment is delivered directly to your door in a reusable returnable box or bag.
🚚 Delivery
- Choose your rental start date.
- We recommend selecting a start date 1–2 days before you need the equipment to allow time for delivery.
- We ship using Royal Mail or DPD, depending on the size of your order. We’ll let you know which courier is used.
↩️ Returns
- A pre-paid return shipping label is included in your box or sent via email.
- When your rental ends, simply repack the equipment and drop it off at any Collect+ drop-off point.
- Find your nearest Collect+ location here: Collect+ Store Finder
- Please make sure the Collect+ location accepts the relevant courier (Royal Mail or DPD, as specified on your label).
🔍 Inspection & Security Hold
- Once returned, all equipment is inspected and cleaned.
- If everything is in good condition, your security hold will be released.
- If damage is found, we’ll contact you to arrange payment in line with our Rental Terms & Conditions .
Accidental Damage Cover
Accidents happen outdoors. Add Accidental Damage Cover at checkout and if your hired kit is accidentally damaged, you only pay the first £50 of the repair or replacement cost. If everything comes back fine, there is nothing extra to pay.
Covered: unintentional damage in normal use, such as torn tent fabric, snapped poles or broken pegs, across the tent body, poles, pegs, guylines, footprint and included accessories.
Not covered: theft or loss; damage from neglect, misuse or not following setup and care instructions; use in conditions beyond the product's limits.
It is a waiver of liability, not an insurance policy, and does not cover trip cancellation, injury or third-party damage. Read the full terms.
Security hold
A security hold will automatically be added to your Cart. No charge for this will apply at Checkout.
It allows for the possibility of charges in the future for late return, damage fees or non-return fees in accordance with our Rental Terms & Conditions .
What's in the bag
Sierra Designs Flex Capacitor 40-60L backpack Hipbelt, fitted Cleaned, emptied and inspected before every hire
Carries 40 to 60 litres in one expandable backpack, built for lightweight multi-day trips. Hired with the hipbelt fitted. Every pack is emptied, cleaned and checked over before it goes back out. Most commonly hired by walkers heading out for multi-day hikes, and by anyone wanting to try a lightweight frame pack before committing to buying one.
Why it's good
- Expandable Volume: Gusseted front panel opens for 15 to 20 extra litres, then cinches back down for shorter trips.
- Expands Outwards: Volume grows sideways rather than upwards, so a full load stays close to your back instead of towering above it.
- Y-Flex Suspension: A DAC alloy Y-shaped stay runs into the hipbelt to transfer weight onto your hips.
- Zipped Lid Access: U-shaped top zip opens the main compartment in seconds with no roll-top to fasten.
- Ventilated Back: Two scapular pads and a lumbar pad create an air gap between you and the pack body.
- Shoulder Pockets: Two stretch mesh pockets on the straps keep a phone, snacks or a small bottle within reach.
Complete the kit
Pack the
rest too
Add a sleeping mat, bag and stove to the same hire and it all arrives together, on the same dates, in one box.
How hire works
-
Pick your dates
Choose your hire length and the day you want it delivered.
-
We post it to you
It arrives on day one of your hire, cleaned, checked and ready to use.
-
Post it back
Drop it at your nearest parcel shop with the prepaid label. No deposit, just a card hold released on return.
