# Double-wall boxes, 18 x 12 x 8 in, 15 pack > Fits a boxed pair of trainers with room for padding. - Boxes, Best value - Typical UK price: £22 to £34 (a typical band, not a live price) - Platforms: Whatnot, eBay, Vinted, TikTok Shop, Depop, Etsy - Orders a week: 0–2000 - Not yet checked by a person Double-wall board resists crushing better than single-wall, so your boxed trainers arrive intact. ## Kit rankings - #3 in [Best shipping boxes for UK home sellers](https://sellersetups.com/kit/boxes) ## Setups - [Anime figure garage for TikTok Shop and eBay](https://sellersetups.com/setups/anime-figures-tiktok-shop): Box protectors, double-wall cartons, a ring light and a tripod for selling boxed anime figures and blind boxes in short TikTok videos and on eBay. - [Christmas toy rush setup for October to December](https://sellersetups.com/setups/christmas-toy-rush): Stock shelving, a packing bench and a fanfold label printer for selling toys through the Christmas peak, from pre-orders to January returns. - [Clearance lock-up setup for Whatnot, Etsy and eBay](https://sellersetups.com/setups/clearance-lockup-live-and-etsy): Sort a cleared unit into four zones in a weekend, open mystery crates live, and keep the 20 year old pieces back for Etsy. - [eBay electronics reselling setup](https://sellersetups.com/setups/ebay-electronics-reseller): A testing bench, bagged cables, double-wall boxes and clear battery rules for reselling 10 to 50 phones, consoles and gadgets a week on eBay. - [Snack box seller in a registered spare room](https://sellersetups.com/setups/food-snack-box-spare-room): World sweets and crisp boxes sold on TikTok Shop and eBay, from a spare room set up around council registration and best before dates. - [Garage setup for 150 to 300 orders a week](https://sellersetups.com/setups/garage-150-orders): The step up from a spare room: a garage or small unit with picking shelves, two packing tables and a printer built for volume. - [Golf club and sportswear setup for eBay and Depop](https://sellersetups.com/setups/golf-clubs-sportswear-garage): Single irons in cut-down boxes, retro football and tennis tops in grey mailers, and a garage split into a clubs side and a clothing side. - [Vintage ceramics and glass from a spare room](https://sellersetups.com/setups/homeware-ceramics-glass-room): A spare room set up for jugs, vases, tea sets and studio pottery sold on eBay and Etsy, with packing built around zero breakages. - [Japanese import reseller with proxy buying](https://sellersetups.com/setups/japan-proxy-import-desk): Prize figures, Japanese-language card boxes and stationery bought through a proxy, then sold on Whatnot shows and eBay listings from a spare room. - [Outdoor gear setup for a shed or garage, eBay and Whatnot](https://sellersetups.com/setups/outdoor-gear-shed-seasonal): Tents pitched on the lawn before listing, tackle sold live in lots, and a 40 kg scale for the family tent that a medium parcel will not take. - [Preloved designer handbag room for Vinted and eBay](https://sellersetups.com/setups/preloved-designer-handbags): Softbox light, dust bags, stuffing tissue and double-wall boxes for selling secondhand designer bags that arrive holding their shape. - [Toy and collectibles live selling setup](https://sellersetups.com/setups/toy-collectibles-live): Box protectors, double boxing and coded shelving for selling construction sets, die-cast cars and vinyl figures live on Whatnot and on eBay. - [Trainer reselling setup for a small room](https://sellersetups.com/setups/trainer-reseller-small-room): Shelving for 60 boxed pairs, authentication-ready photos and double-wall packing for a trainer reseller on eBay and Vinted. ## Boxed trainers, electronics and heavy stock Use double-wall boxes for boxed trainers and electronics, or heavy homeware that must arrive without a dent. At 18 x 12 x 8 inches, this size takes a boxed pair of adult trainers with room for padding round the shoebox. A 15 pack covers a trainer or electronics reseller posting a few boxes a week. If you post high volumes from a garage, buy by the bale from a packaging supplier. ## Flutes, flaps and internal size Double-wall board has two fluted layers, so the cartons stack higher and resist more edge pressure. Look in the listing for the flute combination, such as BC, and an internal size in inches or millimetres. The quoted size is usually internal and the outer box is a little larger, so check the outer size against postage limits. Full flaps top and bottom let you seal the carton with an H-seal. Reject cartons that arrive creased or with crushed edges. Measure your largest boxed pair of trainers before you buy. Some high-top and large-size shoeboxes need a bigger carton. ## Packing boxed trainers or electronics Tape the base with an H-seal of brown parcel tape. Lay a bed of bubble wrap or crumpled paper, then wrap the shoebox or product box in a layer of bubble wrap to keep its corners sharp. Pack void fill into each gap until the inner box cannot shift. Close and seal the top, then put the label on the largest face, away from the seams. Weigh and measure the packed box before you buy postage. A larger, heavier box costs more to post, so compare it with the courier's current price bands for its size. ## Single-wall boxes or rigid mailers instead Small single-wall boxes in a 25 pack cost less per box and suit light items under a couple of kilos that only need a rigid shape. Rigid mailers suit flat items and add less weight to the parcel. For high-value jewellery or bags, put Rigid presentation boxes, 10 pack inside a double-wall box, and keep the presentation box clear of tape and labels. ## £1.47 to £2.27 a box against a refund At £22 to £34 for 15, each box costs more than a single-wall box. On a £150 pair of trainers, a refund for a crushed shoebox costs you the sale as well as the carton. If you sell boxed trainers or collectibles, buyers judge condition by the box that comes with the item, so keep that box undamaged. Add the carton cost to your listing price. ## Common mistakes - Wrap the shoebox and fill the gaps, or the corners crush against the carton walls. - Don't tape a label onto the product's own box. Put boxed stock in an outer carton and label that. - The quoted size is usually internal, so the packed parcel can come out bigger than you priced for. Measure the packed box. - Seal the bottom with an H pattern, or a heavy base can split open with only the top taped. - Don't reuse a crushed carton for heavy or fragile items, because it has lost strength. ## Guides - [How to post bulky items: bikes, golf clubs, prams](https://sellersetups.com/guides/how-to-post-bulky-items): Courier size limits for long and heavy parcels, how to work out length plus girth, and how to pack a bike, a golf bag, gym weights and a pram. - [How to post Funko Pops without crushing the box](https://sellersetups.com/guides/post-funko-pops): Collectors buy the window box as much as the figure. Protector, outer carton and void fill keep corners sharp and the window clear in transit. ## Questions ### Do 18 x 12 x 8 inch boxes fit boxed trainers? They fit most adult shoeboxes with room for padding. Measure larger sizes and high-top boxes before buying. ### Is double-wall worth the cost over single-wall? For heavy or fragile items, yes: one damage refund costs more than a box at £1.47 to £2.27. ### Can I post these boxes with Royal Mail? Measure and weigh the packed box, then compare it with Royal Mail's current size guide. A larger box may suit a courier service better. ### Is the listed size internal or external? Most listings quote internal size. The outer box measures a little more. ### How much padding do I need inside? Enough that the inner item cannot move when you shake the box. Leave room for padding on each side.