What are the internal diameter size?

The bag is rectangular rather than round, and the internal dimensions are almost the same as the external dimensions, as the bag wall thickness is negligible.

Do you need the inflatable things if i have roof bars?

You don’t if you can position your roof bars. Ours are fixed position so could only tie on to one roof bar. However using the roof bars & the inflatable supports spreads the weight really evenly. I suggest both if you can !!

what are the dimensions of this when it is unpacked? Thanks

The dimensions are listed on a picture on the Amazon advert

How to thread short strap into the tooth holder/hole? Strap too thick.

The short straps pass through 1 of the 3 webbing mounting points on the underside of the bag in each 4 corners of the bag. You need to offer the bag to the roof bars and choose the point that aligns with each bar. This system provides adjustment depending on the pitch of your roof bars when you fitted them. The short straps have a grippy rubber side to prevent slipping on the roof bars when fitted, you need to depress the metal cam to make the gap wide enough to pass the strap end through.

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HandiHoldall XL 400L Waterproof Roof Bag / Top Box (Black) – Cargo Carrier with Foldable Solid Base

Product ID: 68321464

Details

Brand
HandiWorld
Colour
Black
Item weight
4 kg
Material
Polyester with
Product dimensions
59L x 17W x

💧100% waterproof PVC-coated

📦400L ultra-capacity

🛠️Foldable solid fiberglass base

Description

🚗 Elevate your road trip game with the ultimate foldable roof cargo boss!

WEATHERPROOF ARMOR - Fully welded seams + storm flap keep rain, sleet & dirt out.
QUICK UNIVERSAL FIT - Includes roof bar kit & lockable zippers for secure, hassle-free mounting.
COMPACT FOLD STORE - Rolls down to 59x17x17cm for zero garage clutter.
MASSIVE 400 L STORAGE - Pack 2x large duffels or all your family gear with ease.
RIGID BASE STABILITY - Fiberglass poles create a flat, sag-free platform like a hard box.

The HandiHoldall XL 400L is a premium waterproof soft roof box featuring a foldable solid fiberglass base for stability, offering massive 400 litres of extra luggage space. Its durable polyester PVC-coated fabric with heat-welded seams ensures complete weather protection. Designed for universal roof bar compatibility, it folds compactly for easy storage and includes lockable zippers and a fitting kit for secure, effortless installation.

Specifications

ASIN	B07CZHW2P6
Automotive Fit Type	Universal Fit
Best Sellers Rank	86,931 in Automotive ( See Top 100 in Automotive ) 39 in Roof Boxes
Brand Name	HandiWorld
Closure Type	Zipper
Colour	Black
Customer Reviews	4.1 4.1 out of 5 stars (245)
Folded size	59 cm (l) x 17 cm (w) x 17 cm (h)
Global Trade Identification Number	05060158520398
Included Components	Glass fibre support poles, Instruction leaflet, Roof Bar Fitting Kit, Storage bag
Item Dimensions L x W x H	59L x 17W x 17H centimetres
Item Type Name	HandiHoldall 400 Litres - waterproof easy to store foldable roof box
Item Volume	400 Litres
Item Weight	4 kg
Manufacturer	HandiWorld Ltd
Manufacturer Part Number	HHOLDALLWP400
Manufacturer Warranty Description	One year warranty against manufacturing defect
Material Type	Polyester with PVC coating
Model Number	HHOLDALLWP400
Mounting Type	Roof Mount
Number of Items	1
Shell Type	Soft
Water Resistance Level	Waterproof

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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