Underseat wheelchair bag: 10 reasons you need an Adaptdefy bag

The short answer. The Adaptdefy Underseat Bag range covers rigid and folding wheelchairs. Ten features define it: a lightweight build, adjustable straps, four quick-release buckles, a two-pocket layout, easy-pull zips, colour-coded zips, an enlarged front pocket, water-resistant material with a semi-rigid base, internal binding with double stitching, and a size range fitting chairs from 11 to 22 inches.

I've used a lot of wheelchair bags. Most of them were designed by someone who has never had to find a set of keys by touch, under their own seat, in the rain, while holding a coffee.

For years my answer was a backpack hanging off the back of my chair. It worked, but it meant twisting around to reach anything or asking someone to grab it for me. You've been there, right?

That's why we built ours. There are two bags, one for rigid wheelchairs and one for folding wheelchairs, because the two chairs need different mounting systems. One bag trying to fit both would fit neither properly.

Here are ten things we got right, and why each one matters more than it sounds.

1. It's super lightweight.

The rigid bags weigh 264 to 432g (9.3 to 15.2oz) and the folding bags weigh 294 to 368g (10.4 to 13oz). That's less than a full water bottle.

Weight on a chair isn't something you only notice on a spec sheet. You feel it on every push, every ramp and every kerb, all day. A heavy bag is a bag you stop using by week three.

2. Adjustable straps put it exactly where you want it.

Both bags mount without tools, and both let you set the height.

The rigid bag uses two strong adjustable Velcro straps over the seat base. The folding bag uses four adjustable looped straps that wrap around the frame, so the bag sits upright in front of the cross bar (here's why that matters). Either way, you set how high or low the bag hangs so it clears your brakes, wheels, footrests, a rigidiser bar, LapStacker or a power add-on.

Install takes seconds. No tools, no workshop, no waiting on someone else.

3. You can remove it while you're seated.

This is the one I'd keep if I could only keep one.

Unclip the four corner buckles and the bag lifts onto your lap. The mounting straps stay exactly where they are on your chair, so there's nothing to refit afterwards.

Airport security. Repacking at the car. Digging for something at the bottom of the main pocket. Folding the chair for transport. Four clicks and it's done, without bending over the side of your chair. For more ideas, read 4 clever ways to use an Adaptdefy underseat wheelchair bag.

From our customer research: "Not everyone can bend over to an under-seat bag." For anyone with limited core stability, spastic legs or limited dexterity, that's the difference between a bag you use and a bag you gave up on.

4. Two pockets for everything you carry.

There's a main compartment for the bulky stuff and a front pocket for the things you reach for constantly.

Phone, wallet, keys and snacks live in the front. Your jacket, lunch, laptop and shopping go in the main. You stop rummaging, which sounds minor until you've done it fifty times a week.

5. The zips are easy to open.

Every zip has a finger loop.

You don't need a pinch grip to open either bag. Hook a finger and pull. If you've got limited hand function, or your hands are just cold, this is the feature that decides whether the bag is usable at all.

6. The green zip shows you which pocket you're opening.

Green means main pocket. Black means front pocket.

You can't see under your own seat. Colour coding means you find the right pocket with a glance, and the two different zip positions mean you can find it by touch.

Another line from the research: "I can't see into it, so I need to identify items by touch." Read that back and the green zip stops being a styling choice.

7. The front pocket fits big phones.

Phones got bigger. Our version 1 front pocket didn't.

We enlarged it and added a gusset, so the largest phones fit even with a chunky case on. This change came straight from customer feedback, which is true of about half this list. See all 6 upgrades we made from version 1.

8. It's water-resistant, with a semi-rigid base.

Rain, puddles and spilled coffee happen. The water-resistant fabric helps protect what's inside. The semi-rigid base keeps the bag's shape and stops your gear sagging, with enough flex that it still sits neatly under your seat. The lining wipes clean in seconds.

To be straight with you, the bag is water-resistant, not waterproof, and it's not insulated. It handles rain and spills. Don't dunk it.

9. It's built to last.

Internal binding smooths the edges inside the bag. Double stitching goes on the strap attachments, which is where all the load ends up.

Every bump, every kerb drop, every time you overpack it with groceries because you told yourself you'd only get three items. The straps are where a cheap bag fails. We reinforced ours and finished the inside properly at the same time.

10. Sizes and designs to fit most manual wheelchairs.

One bag doesn't fit every chair, so we made two designs across five sizes.

• Adaptdefy Underseat Bag for rigid wheelchairs: Small, Medium and Large, fitting outside widths from 11 to 22 inches (280 to 560mm), with 7 to 16 litres of capacity. The Large takes a laptop up to 15 inches.
• Adaptdefy Underseat Bag for folding wheelchairs: Medium and Large, fitting outside widths from 14 to 22 inches (355 to 560mm), with 10 and 14 litres of capacity. It mounts vertically in front of the folding cross bar, so it works with chairs whose seat base separates from the frame.

Measure from the outside of one tube to the outside of the other, then check the sizing matrix. There's overlap between sizes, so more than one may suit your chair. If you're unsure, send us a photo of your chair and we'll confirm before you order.

Rigid or folding, which bag do you need?

	Rigid wheelchairs	Folding wheelchairs
Sizes	Small, Medium, Large	Medium, Large
Chair width	11 to 22 in (280 to 560mm)	14 to 22 in (355 to 560mm)
Capacity	7 to 16 litres	10 and 14 litres
Weight	264 to 432g	294 to 368g
Position	Horizontal, under the seat base	Vertical, in front of the folding cross bar
Mounting	Two adjustable Velcro straps over the seat base	Four adjustable looped straps around the frame
Removal	Four quick-release buckles	Four quick-release buckles
Zips	Colour-coded, finger loop on every zip	Colour-coded, finger loop on every zip

The short version: if your chair folds and the seat base separates from the frame, you want the folding bag. If you're on a rigid frame, you want the rigid bag.

Built by wheelchair users, for wheelchair users.

None of these ten came out of a design meeting. They came out of customer emails, survey answers and my own frustrations with gear that was clearly designed by someone who had never used it.

Find the size that fits your chair, and stop carrying your day on your lap.

Shop the Adaptdefy Underseat Bag range

Frequently asked questions.

What's the difference between the rigid and folding underseat bags?
The mounting system and how the bag sits. The rigid bag sits horizontally under the seat base on two Velcro straps. The folding bag sits vertically in front of the folding cross bar on four looped straps that wrap the frame. Both use four quick-release buckles for removal.

Which size underseat wheelchair bag fits my chair?
Measure the outside width of your chair, from the outside of one tube to the outside of the other, and check it against the sizing matrix. The rigid bag comes in Small, Medium and Large for 11 to 22 inch chairs. The folding bag comes in Medium and Large for 14 to 22 inch chairs.

Can I take the bag off while seated?
Yes. Unclip the four corner buckles and lift the bag onto your lap. The mounting straps stay on your chair, so there's nothing to refit.

Is the underseat bag waterproof?
No. It's water-resistant. The fabric protects your belongings from rain and spills, and the lining wipes clean. It's not insulated and shouldn't be machine washed.

Can I use the bag with LapStacker?
Yes. The bag works with LapStacker without interfering with your chair, and the straps adjust so the bag hangs clear.

Is the bag easy to open with limited grip or strength?
Yes. Every zip has an easy-pull finger loop, and the colour coding means you find the right pocket by glance or by touch.

I'm a T10 complete paraplegic and I know not everyone has the function I do. Do your best with what you've got and continually look to improve your skills.

Happy Adaptdefying.
– Mike

About the author.
Mike Brown is a T10 complete paraplegic and co-founder of Adaptdefy. He has spent 14 years living, problem-solving and building as a wheelchair user, and every product Adaptdefy develops is shaped by that experience. Adaptdefy's mission is to solve everyday, real-world problems for wheelchair users and the adaptive community.