Ultra-strong paper for secure shipping
RAJA extra strong paper bubble envelopes protect fragile items in the post, pairing a tough outer with shock-absorbing cushioning. Where the outer envelope takes rough handling, the 140gsm brown kraft paper face of these extra strong bubble envelopes adds strength before the air-bubble lining does its work.
The paper carries FSC Recycled certification, and each envelope closes with hot-melt adhesive under a 22mm silicone peel and seal strip. Six sizes run from 150 x 210mm to 350 x 470mm, and the lightweight construction helps reduce postage costs. Sold in packs of 100, with the 350 x 470mm size supplied in packs of 50.
Where do extra strong bubble envelopes work best?
This range sits at the top of the RAJA UK bubble envelope offer, built for businesses that need a brown envelope with bubble wrap lining that holds up through sorting and handling.
- Cosmetics and fashion accessories for e-commerce orders: the bubble lining absorbs knocks in transit, so products reach customers in saleable condition. A document enclosed wallet on the outside keeps the invoice or returns form with the order.
- Jewellery and gifts: small, valuable items get a cushioned pocket inside a 140gsm kraft outer, giving more protection than a standard paper mailer.
- Electronic accessories and spare parts: items with hard edges press against the envelope wall, and the heavier paper gives the outer extra strength where corners rub. Pack loose screws, cables and small components in grip-seal bags first so nothing goes missing in the envelope.
- Books and stationery from office dispatch: the lightweight build helps keep postage costs down on regular, high-volume mailings, and thermal labels print addresses quickly when you’re sending in bulk.
Not suitable for:
- Documents or photographs that must stay completely flat, as a brown envelope with bubble wrap protects against knocks but does not stop bending. Use board-backed cardboard envelopes where rigidity matters.
- Bulky or boxed items larger than the 350 x 470mm maximum size. Use postal boxes for larger or heavier consignments.
Specifications:
- Material: kraft paper
- Paper weight: 140gsm
- Colour: brown kraft
- Lining: air-bubble cushioning
- Closure: hot-melt adhesive with 22mm silicone peel and seal strip
- Certification: FSC Recycled
- Sizes: 150 x 210mm, 180 x 260mm, 220 x 260mm, 240 x 330mm, 270 x 360mm, 350 x 470mm
- Pack quantity: 100 (350 x 470mm: 50)
Choose the right bubble envelope:
These extra strong bubble envelopes are the strongest paper option in the RAJA bubble envelope range, chosen for their 140gsm kraft outer.
- Choose this product when the envelope will face rough handling and you want a heavier paper face protecting fragile contents.
- Choose RAJA Bubble Envelopes when you post lighter, less vulnerable items and a standard paper weight is enough.
- Choose RAJA Heavy Duty Bubble Envelopes when your packing process is set up around that range and the size you need is still listed.
FAQs:
Why choose extra strong bubble envelopes over standard ones?
The 140gsm brown kraft paper outer is heavier than standard bubble envelope paper, so it stands up better to abrasion, pressure and corners rubbing during sorting. The air-bubble lining inside cushions the contents, so you get a tougher outer and shock absorption in the same envelope.
How secure is the closure?
Each envelope seals with hot-melt adhesive under a 22mm silicone peel and seal strip. The strip keeps the adhesive clean until you’re ready to use it. Once you peel it away and press the flap down, the envelope closes firmly without needing tape.
Will the heavier paper add to my postage costs?
The envelopes are designed to stay lightweight, so the stronger paper doesn’t add much weight to each item. This helps keep postage costs down, particularly on regular or high-volume mailings.
Which size do I need?
Measure your item and add 10mm to each dimension so it slides in without straining the seal. The six sizes run from 150 x 210mm for small items such as jewellery up to 350 x 470mm for larger goods such as books.
How many envelopes come in a pack?
Most sizes come in packs of 100. The largest size, 350 x 470mm, comes in packs of 50.
Also useful:
- Jiffy bags for comparing gold, white and other bubble bag mailers across the range.
- Envelopes and mailing bags for weighing these bubble bag mailers against poly and padded options.
- Labels for recipient details on the paper outer.
