Transporting A Brompton by Dimpa: Step 3. Place your wrapped Brompton into a Dimpa bag from Ikea, placing a cinch strap vertically around the Dimpa bag .
Amazon.com: London Craftwork Carrier Bag for Brompton Bike Bicycle Carry Cover Travel Airplane : Sports & Outdoors
Storage Bags - Heavy Duty Bags - Extra Large Tote Bag - IKEA
Amazon.com: Ikea DIMPA 3 pcs Extra Large Storage Bag, Clear Heavy Duty Bags, Moth and Moisture Protection Storage Bags : Everything Else
Beware of people selling the IKEA DIMPA bag (£3 from IKEA) on eBay for 3x the price - they photoshop/remove the label so you don't know it's from IKEA : r/Brompton
2 x IKEA DIMPA Large Clear Transparent Plastic Zipped Storage Bags | eBay